“You are joining my character when he is really unraveling,” the Sherlock alum teases.

We all know what happened next.

“We weren’t allowed to do any of that.”

Martin Freeman in ‘Responder’

Martin Freeman in ‘Responder’.Britbox

“Tony was a real gold mine for me,” Freeman says.

“He was a treasure trove.

‘So how do you feel when this happens?

What about when you go to a sudden death?

What do you do then?’

All this stuff that I have no firsthand knowledge about.

He was a useful tool for that.”

“He deals with everything from domestic violence to sudden death to rape to robbery,” Freeman says.

“He’s been doing it for a long long long time.

“So I’ve worked with David a few times over the years in minor ways.

When David was cast I just thought, there’s no one better for this.

Freeman also confirms that Schumacher is currently at work writing a second season of the show.

“That is correct, yes,” he says.

We’re a long way from it looking like a neat and tidy plan.”

The Responderis now available to watch on Britbox.

Watch a trailer for the show above.