Looked around at various air pumps, but I have gone for the Tetratec APS 300 which is able to pump 300 l/Hr. The Vincenza should hold 240l when full, so this should be good with a little bit of headroom – better too much oxygen than too little I think.
http://www.zooplus.co.uk/shop/fish/technic_and_accessories/oxygen/102731
It’s arrived and I have the adapter that they advise on the site to make it work in the UK, but tempted to cut the plug off and fit a standard plug myself – I am ok with a scredriver and wire stripper 🙂
iainonthemove 
Are you OK with a screwdriver I think not. Be careful it may bite you