I’ve been on this quest myself and drawn a blank. LAS advertise the bits but boy you really don’t want to know their prices! I’ve tried HM Sales at Stock and some of the other surplus dealers like Anchor Supplies but no-one seems to have the bits, or they just don’t know what to look for. UK Surplus (MOD disposal Agency) probably have pallet loads of them at Stafford, judging by the way everything is going out of service, but then again we both know how half this stuff just gets slung in the skip when a Squadron gets the axe! Good luck and if you find a load, buy them up and remember me! 🙂