Right, to cut a long story short (ish LOL) I made another 'tour' of local garages today. After 5 or so, "sorry but no's" I found a garage that doe's repairs to HGVS. I've left the old & replacement struts with them. They 'think' thay may be able to swap the spring & shock over for me (cos I'm stumped). When I showed them the dented tube. it was a lot of 'sucking & blowing' through gritted teeth, 5 or 6 'Gallic shrugs' followed by, "leave it with us". Still waiting with everything crossed!