there shouldn't be stamp tax on futures, I'm not sure about liquidity or charting packages. Offhand, I'd say the futures are much more liquid than HK. However, if you wish, I can contact our European traders and get the info on Monday.
I should probably also add that the following European markets are now offered besides the UK:
france - futures
germany - stocks/futures/options
switzerland - stocks/warrants
I haven't tested yet but I believe they can be traded from one screen and/or account.