Found one!

Ant spent Sunday afternoon 'tinkering' whilst I spent it 'pottering' and as a result the fuel gauge is now working correctly (he discovered the adjustable level meter needed adjusting), the curtains, indicator switch and dashboard panel are out and ready for repair / replacement and the veggie patch is now planted up and full of seeds.

After emailing a load of online parts shops Sunday night, we finally ordered a chrome indicator switch yesterday from http://www.megabug.co.uk/ - fingers crossed its the right one, at £50 its going back if it ain't, or I will have a paddy instead!