Hey i have just had a quick look on ebay for you, i hope i have the right area eccles near salford manchester -right?
you can get a 3ft tank and filter for about £30 hope it helps x x

http://cgi.ebay.co.uk/FISH-TANK_W0QQ...QQcmdZViewItem
http://cgi.ebay.co.uk/Juwel-120-litr...QQcmdZViewItem
http://cgi.ebay.co.uk/FISH-TANK-3-FT...QQcmdZViewItem