Please be careful with that BB_Alpaca,
It requires some text editing and may need some database adjustments.
It would not be the first time a generous Admin corrupting the whole forum, just because of a member request

Not because I don't think you can do it, but because I needed to help a friend who did just that

It's very tricky.
But the option to select GMT+1 and set the 'automatically detect DST setting' should do the trick.
Best is to see why his setting are reset to GMT+1, maybe his timezone is GMT+1 with DST (that would make it GMT+2)
just my 2 cents
