Hello,
I tend to use some of the sports betting websites, online casinos and spread betting companies ..... but to help prevent "panic" within my Bank, I tend to transfer funds in and out, via my NETeller Account. As such, it doesn't appear on my bank statements, in quite the same way as a selection of well known bookmakers etc might.
Like all things in this life, NETeller charge fees but it's a reliable service in my view, offers hard and electroic debit cards and has a reasonable online offering, so all things being equal I'm comfortable in recommending it as a simple user.
Hope this helps.
Regards
Mr. Earl.