I'd love to give you good news buddy, but i've got a lovely SCI dot tank sitting at home, un loved and unused!.
HSE and DOT are, if my reading of the HSE website is correct, tests on the manufacturing processes, and require something like 30 or 50 bottles to be sent to the relevant agencies for "Thourough" testing. i.e. they get blown up, cut up, crushed, imploded etc. you get the idea.
Your best bet is to cancel your tank, like yesterday, and buy one here. Anyone else know any different? Please, i'd like to use my other tank!
Laterz
Ian
p.s. Many of the DOT standards are used in this country, up to about 125 bar. In fact many site the American regulations as sources, and state they are acceptable in the UK.DOT-E (sorry, forgot the numbers) is not, however, and this is the one pertaining to high pressure, portable, fibre wrapped tanks!