Hello Stoney,
Which end of Surrey are you? At the Kent / Sussex end is
Wins and Co, he's not the cheapest but if you are local enough to collect saving the postage often makes the difference.
Screen rubber - Wins price was keen last time I got one.
Overhaul kit - definately join the club and buy from it. There are cheaper sets on ebay advertised for sprint but it's pot luck as to whether what you get actually fits. Same goes for all hydraulics on Dolomites, the only way to be 100% certain you are getting the correct part is to order from the club. Even the big name suppliers get it wrong.
Service parts - again best to start with the club. There is no such thing as a cheap original distibutor cap and arm for a sprint. The club do an alternative set which IIRC is a little cheaper than standard and was for a while all that was available.
Request a catalogue from Rimmers, they often have sales on and in past years have had one on Dolomite parts each Jab - Feb time. Once you are on the mailing list you'll get notification of relevant sales.
Tinweevil
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1978
Pageant Sprint - the rustomite, 1972
Spitfire IV - sprintfire project, 1968
Valencia GT6 II - little Blue, 1980
Vermillion 1500HL - resting. 1974
Sienna 1500TC, Mrs Weevils big brown.