Goodnight Sweetheart (1993)

When Two Worlds Collide - S5-E3

Continuity mistake: Gary has to feel around in mid air for the portal as the wall has just been bombed. But when he reaches through, later, his arm comes out of the wall which has somehow returned.

Ron Wheatcroft: You're hyperventilating, Gary. Put your head between your knees.
Gary Sparrow: What, so I can kiss my arse goodbye?