Just to close this post - yesterday I got the remaining 7 bolts out using plus gas. I had not realised how much better this stuff is at releasing rusted bolts than WD40. The bolt I had previously sheared I was able to drill out using 2mm then 3mm then 4mm drills then the final 1/4 BSF drill. I then retapped the hole 1/4 BSF. I had to remove the shock absorbers to get at two of the bolts. Thanks for everyone's help.
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