So, chatting today with the fine folk on the ZX Spectrum #Emulation discord channel I had another breakthrough with my emulator. I won't go into the detail here, but it was to do with how I was handling the ULA and port IO.

Sorting this particular bug fixed a bunch of games, both for 48K mode and 128K.

Here's a gallery...

Dizzy, The Ultimate Cartoon Adventure

Treasure Island Dizzy

Fantasy World Dizzy

Cybernoid

Batman - The Movie

Robocop

Robocop 2

And, of course, how could we forget...

Manic Miner

As ever, source code all here.