It should have been ready for bottling around the 25th - 28th of August but it didn't stop gurgling until a couple of days ago. The guys who supplied the kit said this was fine and encouraged me to leave it for as long as possible before bottling, so after a mammoth wait it's a case of job done.
All I have to do now is wait for three weeks for the last bit of magic to occur in the bottles and it will be ready for drinking.