I am looking to get a computer and not sure which type to get - only want the basic functions of speed and distance really as I'm not looking to spend a lot!  Can anyone recommend a brand/model that won't push me over around 30 quid?

Halfords most basic model is £9.99 but it still has 9 different fucntions, or about £20 I think if you want a wireless one.

Go for a wireless one, the wires tend to break on the others, and just get a known brand.  The simple ones are the best - I still don't know how my expensive many-function one all works