The Somerset Tune is definitely not the one for the Watersons' version. Try this:

T:APPLE TREE WASSAIL
M:3/4
L:1/8
C:Trad
S:Watersons "For Pence and Spicy Ale"
K:D
|FED DAG|FEDE3|FED DAG|FGED3|
FED DAG|FEDE3|FED DAG|FGED3|
FED A2F|FED E3 FED DAG FGED3||

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