DislikedLMAX keeps track of their average spreads :
http://www.lmaxtrader.co.uk/average-spreads
around 0.7 for EUR/USD for november/december
You won't find better execution than LMAXIgnored
Seems spreads are trending up since the start of the platform:
Averages for week ending 7/1/11
EUR/USD at 1,2
GPD/USD at 2,25
http://www.lmaxtrader.co.uk/average-spreads
Could be due to the lower liquidity after the holidays ?! Regarding the pound, you could trade at half the spread these days. Anyway, will have to see.