I'm wondering if it's possible to retrofit cruise control and what I'd need to fit it. I'm finding that my (usually heavy) right foot aches on long journeys.

It's not impossible, you'll have to get yourself into an awkward spot to check though

 

 

Unfortunately the conclusion of that was that it was possible if you had the right module but there was so much to do that Ollie didn't actually do it.

 

I asked Motormods near Cheltenham if it could be retrofitted to our Citigo SE and they said no (wrong module) but could fit an aftermarket unit with a separate stalk (similar to on my Superb) for £420 + VAT.