Yardbent, If the drive side BB cup is removable by turning clockwise, it's an English threaded BB. If the drive side cup is removable by turning counter clockwise, it a French threaded BB. There are modern cartridge style BBs available:
Velo-Orange Grand Cru French Thread Bottom Bracket Set 110mm - Harris Cyclery bicycle shop - West Newton, Massachusetts . I don't know where in GB they're available.
Brad