Rated by most as the best are the Flying Dutchman blades, but they are not available in the UK.
The best place to get them is here: http://www.mikesworkshop.com/
Mike is a great guy to deal with and a member of this forum,check out his website for all you need to know about blades.. His blades take about 7working days to arrive and postage is at cost,normally just a couple of $$