Lawnmower,
What I did, and what I'd suggest is to look at each bolt in question. Some, ie seat belt bolts and structural bolts, need to be as high a grade as you can get, zinc plated grade 8 should be fine. Non structural bolts, ie those holding the fender sides to the inner fenders, trim bolts etc that bolt aluminum to aluminum should *not* be stainless. This is because stainless is about as far away on the galvanic scale from aluminum as you can get. The resultant corrosion would sacrifice the aluminum...something you don't want to do. Aluminum bolts aren't known for their strength, that's why I only use them in situations where there's high corrosion potential and little strength needed.
I'll use stainless where I don't have a worry about galvanic corrosion. Also, keep in mind that the strongest stainless bolts, will only be grade 5 or so.
Something else I'd recommend, is insulating between dissimilar metals upon re-assembly...I use self adhesive neoprene strips for this...
I'm in the US and I get my supplies from McMaster-Carr...not sure of a source in the UK...
Bogatyr
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Current Rover Fleet:
1996 D1 120k (finally on the road)
1970 IIa 88" (the running one)
1970 IIa 88" (parts truck - need any parts?)
1966 IIa 109" (next project...)
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