On their excellent website there is a page on the 3rd Earl Amherst and interestingly on their Consecration Page, the 2nd Consecrating Officer is listed as WBro H Passmore Edwards SGD. This would appear to be Harry Edwards the son of J Passmore Edwards.
Thanks again to Dean Evans, we now know that J Passmore Edwards was a member of The Cornish Lodge No 2369 which meets in London.