As Trigger Point nears its climactic finale, the ITV drama served up more explosive action on Sunday night, as far-right terrorist group The Crusaders continued their series of co-ordinated attacks.

With another device planted at a London university, it was confirmed that EXPO John Hudson was indeed a a member of the terror cell.

However, after he managed to evade capture, the capital faced its biggest threat of the series, as Lana and the team uncovered a plan to blow up a street of houses near the Progressive Alliance HQ.

Ahead of next week’s final episode, these are the questions we have been left asking…

At the moment, Karl seems like a nice guy, with no reason to be suspicious of, which is now starting to make us suspicious of him.

In a pre-series interview, actor Warren Brown said that “further down the line [Karl] might reveal what some of his demons are”, but we’re now at the finale and we’re yet to see any demons, suggesting they are about to come out in the final episode. Could he be part of The Crusaders? More on that in a bit…

While we had our doubts that Youngblood had actually shared Lana’s suspicions about John with any of his police colleagues, it appears he did, as during a debrief it was confirmed that the EXPO had been under investigation, but it had turned up no evidence.

Is this because evidence was covered up by someone? Youngblood perhaps?

In the days before his death, police found out that Billy was living with his friend Tommy Marshall in Streatham, before he then spent an hour at an unknown address in Brixton before setting off to Farringdon, where the bomb plot was revealed.

Who was it he visited? Was it just Frank Walsh, or was it someone else?

During her interview about Billy’s death, Lana told two lies – that she was with Danny and Mark in the pool hall, when she was actually with Karl; and that Billy hadn’t displayed any far-right behaviour, despite his attack on a Halal butchers.

Youngblood has already confronted Lana after checking duty logs that confirmed Danny and Mark were not with her, so other officers could surely find this out for themselves.

If it does come out that she’d lied about actually being with Karl and he is a member of The Crusaders, it is not a good look – neither is lying about her brother’s racist attack.

Could she end up being implicated?

Prior to setting off the bomb in the university, which was hosting a radio broadcast about an upcoming by-election where candidates for a Progressive Alliance were in attendance, John received a text message, seemingly instructing him to make the call to detonate.

The person who sent it must have been someone who knew that Frank Walsh was unable to do so, having been shot by police, which suggests it was a police officer or fellow EXPO.

The possibility that John was receiving instructions also suggests he is perhaps not the overarching mastermind behind the attacks – so who is?

The police originally thought they were just looking for a third man – the bomb maker – in The Crusaders, but this episode unmasked both John and Frank Walsh, indicating there are many more members of the cell the force haven’t considered. After all, John also must have had some help changing all the gas metres in the street for the far-right group’s latest attack.

While Sonia managed to get hold of the confidential file on HMX319 file from Porton Down, it had been wiped (which could be standard precise or suggest someone is trying to cover their tracks), but she was able to tell that the explosive was originally authorised for use in Afghanistan.

Given that we also knew that the explosive was older than 10 years old, it suggests that perhaps it was obtained by someone serving in Afghan around that time.

We know that Karl served in the military and knew Lana and Nut from a long time ago, suggesting he too might have done tours in Afghan. Just saying…

Some parts of the device used in the university attack were recovered and revealed that the number 1912 was written inside – this is the same number that was written in the airing cupboard where the device was wired in Andy Phelan’s flat at the West Haven estate.

It’s now clear the bombers are trying to send a message, but what is it?

Trigger Point concludes on Sunday at 9pm on ITV.

If you were in any doubt about John’s guilt after what was found in his locker at the end of last week’s Trigger Point, the latest episode seemed to cement his involvement with The Crusaders.

Sunday’s instalment of the explosive ITV drama saw Lana discover John didn’t turn up for work on the day of the Five Oaks attack, before she then saw him seemingly eying up the far-right group’s next target. In a tragic turn of events for Lana, her brother Billy was then killed as he was used as an unwitting suicide bomber, as apparent revenge for a showdown she’d had with John at the police station.

With The Crusaders still at large and suspicions about one particular police officer growing ever bigger, here’s the questions we’ve been left asking this week…

Yep, we’re still waiting on the report from Porton Down on the chemical composition used by the bombers.

The current working theory is that some of the explosives made their way onto the dark web, with traces also suggesting they are about 10 years old.

But we’re yet to get any sort of confirmation on that as Porton Down appear to be taking their sweet time on getting back to Youngblood. That is, of course, if he has even requested the information in the first place. After all, we’ve had our suspicions about him for a few weeks now…

When Lana attended the scene of the burnt-out car one of the terrorists had blown up, there was a camera shot that suggested Lana was being covertly watched. Who was it?

Hamilton made a valid point about the way the bombs were wired so professionally. While Lana said it would have been just second nature to someone with military training and that the bombers wouldn’t expect EXPOs to check the wiring as the circuit would be damaged in any blasts, that is a big bet for them to take, especially if a device isn’t detonated.

After Lana followed John out of their workplace, where she saw him appearing to eye up his next target, she was intercepted by Youngblood, who told her off for following someone who was already under police surveillance. He then refused to offer more details, saying he “couldn’t talk about an on-going investigation”.

Given our suspicions about Youngblood, we can’t help but think that this might be a lie and he hasn’t actually done anything with the information Lana gave him, because he is in on it.

She’s managed to unearth all this evidence against John, and while it might be inadmissible because of the way it was obtained, she’s only told one person (who is also of questionable character). Surely you would be telling anyone with any authority if there was a credible risk to life with further attacks?

Admittedly, she told Hamilton that John was the one they should be watching, but she really needs to give her the receipts so she can take what Lana is saying credibly.

With Billy now dead, will Lana share her suspicions about him with more people? And will he be caught before another attack?

The terrorists have already killed her brother – could she face a similar fate because of what she knows?

Trigger Point continues on Sunday at 9pm on ITV.