I've just been to tropical world to give some advice on diet, housing and general care for the chippies.
They have a really good set up with plans for more enclosures as they are expecting lots more in the future. The owner is new to keeping them and appreciated the help. Especially keeping the mum and babies separate from the rest of the colony.
They had 3 female and 2 male Dilutes, and about 12 Agouti's both sexes.
Dilutes are £40, Agouti £35.