A second-half Darren Livett try and four penalties from full-back Dai Hammond were the only highlights as Weybridge Vandals slumped 47-17 to Guernsey.
The Channel Islanders - unbeaten in London Division Two South West thus far - were fortunate to lead 23-9 at half-time before extending their advantage with four tries after the interval.
Vandals travel to table-topping London Cornish on Saturday looking to end a run of three straight defeats.
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