One here for £100 but as grimmy said you have no knowing when it may fail
http://www.ebay.co.uk/itm/MG-ZT-FREE...#ht_500wt_1180
If you keep for eyes open you can pick them up cheap. There was one on for £30 the other week.
Will find them on Freelanders, ZT and ZS. Dunno if they ever put the KV6 in the 45 or 75 maybe someone will confirm either way.