I recieved this enquiry but I am based in Warwickshire so bit to far for me.
If you are interested let me know and I will forward you their email address.
"We are a nursing home based in Willesden London and we require all the windows on the premises to be cleaned. We also require the guttering to be cleaned and then once annually thereafter. You would also need to be able to provide your own risk assessment/method statement."