That's got to be the most expensive part, but I definitely want to be going for 2.4GHZ.

I've been having a look at Bobblebots FAQ and they recommend these 3 in particular:

* Spektrum RC DX6i/DX7 range
* Planet 5 2.4Ghz Set
* Radio Link 2.4 GHz Set


The last one is the cheapest (£26!), but it has been said that it's better to buy an expensive one now that will do everything I need it to, and last, rather than having to keep buying cheap ones and rack up costs over time. Still, hundreds of quid is a bit much, as the most expensive one.

What would you recommend for the best balance of cost, reliability, and function in a 2.4GHZ, 4 channel transmitter/micro receiver? Any of those, or something else?

Ideally, the £26 model would be good enough. I can't be sure though, until I get more recommends, and it needs to have a micro receiver and have fail safe operation, of course.