The G2A Galebs were brought into the country with the aim of selling them to the public, like the L39, JP etc.
There was, however, very little interest and of the four that were hangared at Biggin I believe 2 went home, one went to the USA and one went to North Weald, (YU-YAB).
An outfit called FCS Ltd who frequently advertise a KraguJ for sale may be able to help you further.
Regards