Martin from Penfolds is brilliant !! I have tried a few saddlers over the years and he is the best by far !!! He is in Sussex but travels to London/Kent/Surrey - phone number is 01444 454164. He never suggests buying a new saddle unless you really need one and is very calm with the horses. Only con is that you usually have to wait a while for an appointment.
I have found it very difficult to find a saddler round here (Guildford) . Have tried a couple of those mentioned and been incredibly dissapointed, one 'Royaly approved' fitter even fitted a saddle so badly that he has caused damage to my horses shoulders, my vet has told me they refuse to recommend this person due to the amount of horses they have treated with saddle related injuries who had their saddles fitted by him.
Brian at TDS was good, difficult to get hold of.
I now use Graham at Cobwebs in Haywards Heath who fits Saddle Co saddles, had him out twice in last couple of weeks as now bought 2 saddles, he spent over 2 hours each time fitting my saddles perfectly and I cannot recommend him enough.