Limits in UDG bank switching trick [solved]

[Felix]

In my latest game (which you can download here), I use the UDG bank switching trick described in the How to Write a Pac Man Clone tutorial. Unfortunately, it only allows UDGs from "\A" to "\U", whereas I need to go up to "\W" -- I have only 8 terrain tiles, but 23 different items. I suspect there is a way around the limitation, but my knowledge of ZX Spectrum development is rusty at best. (I'm lucky to have ZXBasic holding my hand so much, heh heh.) Help, please? Thank you.

Edit: never mind, in the mean time the question was answered over at World of Spectrum. I'm leaving this here for reference purposes.