Hello Ewan,

Brian Lawson's will index includes 1909. There is an entry for:
COX, John Bretherton 1909 GB England [no.]67, [LDS film no.] 0106562.
The will volume is 104.

So you could order the film through a Family History Centre. If Liz looks for it in the MM the film number will be different, although the vol. no and will no. will of course be the same.

Sue