Rough guess here : Strife Veteran Edition

I still need to play this had it ages but it has just sat there installed with virtual dust gathering on it

Nope. This game is free.

Freedoom?

Yep. Freedoom: Phase 1.

Your go.

No wonder it looked like the Doom engine to me, then.

Anyway, new picture!

Nosferatu: The Wrath of Malachi

Correct! The screenshot was a hassle to get, as windows would very much prefer to screencap the desktop behind the game instead. Maybe it's the "vampires don't show up in photos" thing.

Next

Park Patrol

Sure, your turn

Here we go. In which game you look at this map?

ShowStar

Here are the members of the jury.

Ceville.

Austrobogulator answered but forgot to reply/quote you while doing so.