I now have definite information regarding Tom's funeral.
It will be at Islington Crematorium, High Rd, Finchley, London N2 9AG, at 11.00 on Tuesday 16th December. Map link below (I hope it has worked). It's just South of the North Circular Road off the A1000.

http://www.streetmap.co.uk/newmap.srf?x=526967&y=190378&z=0&sv=N2%209AG&st=PostCode&lu=N&tl=~&ar=y&bi=~&mapp=newmap.srf&searchp=

Helen