There is this possibility;
John LANKFER, September 1849, Wisbeach, 14 207
There are 3 males and 2 females on the page including a Martha LAKE
Either Martha Sharpe/e is missing from the page or Martha was married before and widowed.
Searching just Sept 1849 for a Marriage of a Martha, Wisbech is a Martha SLATER, 14 209
May have been mistranscribed???