If you want to keep it, then fit a Valeo or LUK clutch (I suspect Valeo is OE spec) - carparts4less have got LUK ones listed at £85, aepdirect Valeo ones at £125. If you hate it and yourself, save £20 by fitting a Transmech clutch

Probably 5 or 6 hours labour, depending on what is rusted up - so figure in £300 or so for that. Add in a bit for gear oil, diff seals, input seal, and pivot shaft bushes if you do it properly and you are looking at the thick end of £500. Worth doing on a Picasso if it's otherwise reasonable - they are holding their value pretty well.
At least it's not a 1.6 HDi, as the clutch job on those is reportedly horrible....