I posted this up on another thread, but thought that I it might be useful as a separate one.
The printers of the handbook cover, at Dorchester, still have a stock of the leather look wallets and are selling them off, new, on eBay.
I have bought a spare one, and it is exactly the same as the one supplied with my Cowley built car.
Not bad for £4.00 plus P&P
here
Nothing to do with me, but might be useful to replace the horrible plastic wallet, or replace your missing one.
These have now been re-listed see
here