Jane
Did you ever get to the bottom of part b) of your original question? Who was Edward Gawne? The 1841 census suggests 4 possible candidates as Edwin's father:
Edwd Gawne of Malew born c 1801
Edwd Gawne of Maughold born c 1801
Edward Gawne of Rushen born c1806
Edward Gawne of Rushen born c1809
The Maughold Gawne is probably the least likely but any of the other three would fit give that Edwin was baptised in Rushen and lived in Malew. The Malew man was closest in age to Edwin's mother but that may not mean anything.
I have an interest in the Rushen Gawnes of this era