Guernsey were singing in the rain as produced an excellent away performance to earn back-to-back league wins for the first time at this level and continue their unbeaten away run.
Marc McGrath lifted a bouncing ball over the goalkeeper early on, while Allen netted twice in the second half, the latter from the penalty spot.
The Green Lions were also boosted by the return of midfielder Ryan-Zico Black as a substitute, 10 months after breaking his leg, while Tom Creed kept a clean sheet on his debut.
|Shirt||Player||Yellow Cards||Red Cards||Goals|
|3||Tom Martin (Ryan-Zico Black 48')||-||-||-|
|6||Nigel Hutton (Kyle Smith 75')||-||-||-|