Thanks for taking the time to reply.
It wasnt as bad as it sounded. ( As is mostly the case)
Citrus gel, agitate, TM, cleaning wand, and crossing of fingers, and all came out

Huge house, thinks the carpet looks good, as she says she vaccumes twice a week, My arse!
Still didnt see the value of having her year old carpets cleaned throughout properly, but I tried

Should get 10 out of 10 on Checkatrade for this one, but probably wont, bound to find something wrong!
All the best.