Hi CeBe,
Sorry, I misunderstood your first posting.
Holmwood church started burials in 1838. Westcott in 1852 when each got their own church. Before that they would have used the main church, St. Martins in Dorking. There is also the West Street Chapel in Dorking for NC & although the Burial Index shows burials starting in 1730, when I walked around the chapel I could find no evidence of any churchyard. When I asked at the museum nobody seemed to know...so that remains a mystery.
The DMC opened in November 1855. I have a note that I made whilst at the Surrey History Centre that St. Martins closed for burials 21/11/1855.
I would suggest that you pay a visit to the Surrey History Centre at Woking as they have hard copies of MI's of some (not all were surveyed) of the churchyards. By checking these you'll have a good idea of what headstones survived & where they are (saves a lot of tramping!)
I know St. Martins churchyard quite well (having tramped around it at least twice) & can tell you that there are many headstones that are not in situ, many are piled against the back wall & very difficult to get to.
I hope I haven't put you off but it's just a word to the wise as I see you'll be coming from Canada & I would hate to see you waste your precious time.
Have a good trip,
jane