OK, I did a quick Google and it appears there is a company in the UK that can regas struts through the mail - SGS Engineering UK.
They just got back to me and said they can supply new struts for £41.14 for the pair, or regas mine for £29.16 (£9.50 per strut, £5.30 postage + VAT), which includes return postage. They have to inspect the struts to ascertain whether or not they can be regassed.
I'm tempted to have them regassed, so I know they'll be OEM struts.
They're based in Derby and they said they're happy for me to pop in if I'm in the area. Strangely enough, I may need to head that way for work in the next couple of months, so I may do the whole thing in person.
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