It may be a little bit out of your way but I saw some nice sized longfin blue rams in Pet Care in Chippenham.
They are more of a pet shop than a specialist aquatic retailer but the guy that works there is very helpful and I've never seen a dead fish in their tanks.
Could be worth giving them a call
Pet Care
1a St Paul Street
Chippenham,
SN15 1LJ
01249 654 393
Andy
