You need to be qualified or licensed to hold you mate's screwdriver over here or so it seems at the moment. All you need in the UK is to be able to demostrate that you are competent and for someone to give you work. There isn't much out there from what I can tell.
I fitted a new kitchen in for family when I got here and my tools arrived. When it cam to fit the worktop I went out to buy a 12.5mm straight router bit and could't find one anywhere, eventually found just one in a little tool repairers shop and nearly died when I found out he wanted $50 for it. Looked online and all the same prices, ended up buying 5 from the uk and having them posted for £35.