Andy brought next idea :
Is it possible to get spare parts for taps? What has happened is the shaft
that the tap head is connected to has rounded. Its a tap with standard tap
washers, not ceramic discs. Any ideas?

The Plumb Centre sell tap repair kits designed to adapt to a variety of
taps. Basically they are a complete replacement for the working parts
plus knob of a tap, plus various adaptors. Take your existing tap
internals along to see if one would fit.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk