If thats £307 a week garanteed + 4 weeks holiday + clothing + all kit provided etc etc, then he won't have any trouble getting labour. I know a WC in Newcastle whos just packed up to work as a pub cleaner in the morning and kitchen porter in the afternoon, both on NMW.
Our real competition will come from China as an RO/DI WFP for DIY cleaning at £10.
Regards Mal