http://www.gamblingcommission.gov.uk/Gambling-sectors/Online/Getting-a-licence/Do-I-need-a-licence.aspx
I kept up to date while I was a (formerly known as) Personal Gaming Licence holder but Since I resigned it when I left the industry I have not really kept up to date.
Is a fairly good start to giving info on it and is best site for UK gambling and setting up sites for it. Online and using crypto tho their would be a lot more involved since that its crypto and a different type of method of payment as your dealing in personal details or taking credit or debit card payments. If was to do that then got many rules to follow and DPA Data Protection acts to follow too.