Hi.

10 quid is incredibly expensive?

Not incredibly expensive, but still expensive: The Kenwood remote is sold in many shops in Germany for about 35DM (11UKP), while the rio remote is 20UKP which is approx. 66DM.

what does that work out to in cheese burgers?

Ah, the good old cheeseburger economy again. I guess you are talking of McDonnalds cheese burgers. The are around 2.70DM around here (more expensive in areas like Berlin or Munich), so that would be 13 CBs for the Kenwood and about 24/25 CBs for the rio remote.
That's still within limits for me though.

cu,
sven

proud MkII owner (12GB blue/green/smoked, was #080000113 is #090001010)