I have been chasing my local B&Q for 5 years, finally got it, hadn't been done for 5 years so very long pain in ass job.
Have to now try to convince manager to go with a regular clean which would be a nice little job, but as they have never bothered its taking a lot of a struggle.
Go and knock on their door! You never know, with B&Q it seems its down to individual managers, some care some don't, but they do as a company spend a small fortune with 'Initial' cleaners instore!
Good Luck
Goochie