Just a heads up Ian, as it seems beyond your present budget.

The Cambridge Audio SM6 & NP30 both have full support for BBC i-player built in. There are also streaming services available & similar direct access to loads of internet radio similar to on the SBT. So no need to enter the URL in many cases. Can't say I've investigated the streaming services, AIPO is one & C.A. claimed spotify support would be in the pipeline......Rather a long time back, certainly over a year at least. :roll:
A real shame but Richers had a long term promotion on the NP30, selling @ £250 until a coupla months back. It's prolly still well worth it @ the current price of £300 & C.A. added digital pre-amp/Vol. control + gapless playback support for this player some time back.
I've been running an SM6 since February, having previously been using a couple of SBT's. It's a peach & I love it.

:stereo:
The screens on the C.A.'s look to have more display lines & I don't find them too bad for reading from my seated position & the C.A. supplied remotes are particularly good. TBH & I'm sure you're well aware of this an Android Tablet would take the user experience to a whole new level, so would be well worth considering later on. :^ Suitable ones can be found from around £40 .
http://www.amazon.co.uk/s/ref=nb_sb_ss_i_4_14?url=search-alias%3Daps&field-keywords=android%20tablet%207%20inch&sprefix=Android+Tablet%2Caps%2C205.
Quite a few of the Jap mfr UPnP/DLNA players/renderers don't offer built in support for BBC i-player. So this is summat you would always need to research properly, to avoid disappointment. Rather than relying on 'Sales Wazzocks,' who may be clueless as to the specs of products sold in their own place of work. :doh: There may be work arounds for some of these, but as I'm not a user of one I'm not really up ter speed on this. :nup: