There appears to be only one church in Blandford Forum:

Town County Church Map
Blandford Forum Dorset Blandford Forum: St Peter & St Paul
(Still looking for cemeteries in the area)

You can try this site for Blandford - they have a Memorial Inscription Database co-ordinator that you can email:

http://www.opcdorset.com/

...and also the Town Council re: Cemetery

http://www.blandford-tc.co.uk/cemetery.html

....and Dorset Archives hold the Burial PRs for Blandford for the year you want:

http://www.dorsetforyou.com/index.jsp?articleid=2203