Man! You Brits are killing me!! Lol you guys keep asking about plants and I have no clue what you have available to you there. A lot more than we have, I know that lol
I'm going to give you genus names, you'll have to find specific species from there, but at least it's a start.
Ferns: adiantum (maidenhair), nephrolopsis, asplenium, pyrrosia , quercifolix (sp?) and a few more I can't currently think of.
Climbers: ficus sp. This can be pumila (creeping fig), pumila var. quercifolia (oak leaf fig), lance leaf, panama, snowflake
There are climbing and trailing begonias that will work. A bunch of ferns climb well. Rhaphidophora species also climb and will form a shingle type pattern. The cissus genus are also climbers. Pothos and philodendrons will climb or trail. Any of the aroid family will do well in that tank.
I really could go on and on. There are literally thousands of species available out there for a vivarium.
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