Hi Wooler
There are 11 submitted not extracted entries for what appears to be the same Roger Preston on the LDS site, the IGI. One suggests St Alphage.
The registers appear to have been deposited at the Guildhall Library in London.
I'm sure they charge for doing look-ups, but other than the kindness of a Rootschatter going there to look on your behalf, that may be the only way of finding out what the actual entry contains.
From my own experience of looking at very old registers, it may just be his name and a date. However you may be lucky and get a fathers name.
Dawn