Thats it on a nice day DX.
Try not to get fuel at wick it will cost you an arm, a leg and proberly your house.
Kirkwall and Sumburgh still have islanders based there so have avgas.
Stornaway has limited stocks as well but your best to let AirBP know your coming and a rough estimate how much you will need to uplift.
Benbecular and Barra have not a drop of avgas
As your in a C172 I would really recommend a visit to Barra