Why are we in a field and who are you?

Filler post, so here's where the Victoriana adventure begins!

Three people wake up in a field on a fine English summer day. The first one to wake up (Cid) is dressed, but the second (Bob Afette) isn't - he's stark naked. The third is Baldrick Unlike. Neither of them know any of this, because they're all suffering from amnesia.

Cid turns out to be wearing Bob's clothes. Following a smoke plume a bit further away they discover an airship crash site and a dead parrot. They decide this is where they came from, and finding some fetching clothes Cid changes into these - ladies' clothes, for some hitherto unknown reason - and Bob gets his clothes back.

But where are they? WHO are they? And what the hell happened?