Would it be difficult to modify the firmware to support other flash chips? just i'm having a huge amount of trouble finding a uk stockist of supported chips, the closest i found was a chip with a part number close to the Am29LV040B one, but it is Am29F040B so i guess it is no good.

if not i will just have to order some in from the US or China...

Edit, found one stockist on ebay, but £9 a chip... vs £1.50 form the US or china