Hi Crabapple - welcome!
I've sometimes mused about gardening so far North, and as tomatoes are in the news here at the moment, I wonder whether you have almost perfect conditions (shelter, lots of light etc), to pop some plants in under some glass/plastic! John, the 'Boss' here, knows all about greenhouses in exposed conditions...
Toms don't need a lot of heat, but as you will soon have endless daylight, a bit of research into keeping them happy as well as warmish might be one answer, and you have time to do this too!