1. You'll have better luck with responses if you make your thread topic more specific. e.g. "Recommendation for Nexus 7 cable to RC?" Unless someone's out there looking specifically to help you, a one word "cable" doesn't quite cut it.
2. I don't have a Nexus and not sure what's available in the UK, but I'd recommend looking at reviews on the stability of the cable itself. For instance the Kanex lightning cable for iphones/ipads got horrible reviews and people here had poor experiences also. The Iseason one though on Amazon has awesome reviews. No one seemed to have reviewed it here, but I took the plunge and it works great. Comes in a 3 pack and I'm even giving one away to anyone who lives in SF who reaches out to me via PM.
3. Nexus 7 just uses a micro USB, right? Anker is the best according to a lot of review sites for reliable aftermarket lightning cables. They haven't crapped out on me yet and they make micro USB ones too for even cheaper. I'd recommend that from whatever store. Don't get Belkin from Ebay. There are a lot of fakes out there and I'm guessing some may have migrated to Amazon too. Stick to Anker and you won't be sorry. They even have the fancy fabric ones. In addition to reliability, you want a fast connection. These were tested and rated highly. Good luck.
