Jon,
End float should be between 0.10and 0.15mm.
If the Club Spares has no stock all the usual Continental suspects do sell them – but most are currently shut for New Year Holidays.
To save time (and probably avoid stupid carriage charges), I suggest you try Citroën Classics (see ad. on page 38 of latest FP). Their website says they re-open at 08.30 on 4th Jan and I have always found them very helpful for engine rebuild components.
B…..
Bernie