Do not order anything that is on 40MHz as the frequencies it will be on will not be legal in the UK. 2.4GHz should be fine, but check specs from a Euro one with the one on offer.
If you are using 2.4GHz Futaba then consider an FRSky receiver from the UK - £23 from GiantShark. Providing the 2.4 TX module is a Futaba FASST one, then those receivers will work perfectly (I have three) and have been, in my 12th car, completely reliable. No glitches, no brownouts, no failures.
The real problem with getting a radio from HK is that the usual repairers are attached to the official UK importers. They will point-blank refuse any warranty and may well charge over the odds for any repairs. Of all the things to buy from overseas radios are one that I would avoid as if there is anything wrong you are up the creek without a paddle. HTH
