The cemetery is on Shepiston Lane in Hayes and is slightly out of the way for a direct route from your chosen hotel. The cemetery office details are linked below
http://www.hillingdon.gov.uk/article/9845/CemeteriesAs for pubs and restaurants, the nearest pub/restaurant would probably be The White Hart in Harlington, about a mile from the Sheraton Skyline, on the 140 bus route £2.50 per person....
Another pub/restaurant which I am sure most people in Hayes know or have visited is The Pheasant
http://www.pheasant-restaurant.co.ukHayes has changed remarkably since you were last living here, but enjoy your stay and hope you find your relatives resting place.
Finally, access to routes into London would mean a short bus ride into the Airport and then underground from there on. You might want to purchase an Oyster card which will be cheaper in the long run for your travel by public transport.....no cash accepted now.