Hi ellied. It's hard to withstand the pull to get planting when the sun's shining

However, there will be more frosts (and possibly snow) and depending on just where you are in Scotland these can carry on right into June. The psb and kale may well be ok as they are fairly hardy, but the frost may get the caulis and calabrese which are more tender - caulis can be stunted later if they have a set-back even if they look ok. Sow broad beans but not french or runner which would just rot in the soil - they need quite warm
soil to germinate, whereas broad beans are quite hardy. We had a little grass growth for a few days last week, when day and night temps were 7 degrees or more, but that is just temporary and the cold will come back.
The old test is supposedly to sit on the soil with your bare backside to test if it's warm enough

. I think a man made that one up

It's good enough to dig down a few inches then test the soil temp with the inside of your wrist - if it feels cold then it is cold.
To get ahead in the sowing game and to avoid mice etc eating bean seeds, try sowing some things in pots then transplanting them when the soil and weather are warmer. This works for some things such as brassicas (and stops the slugs chewing little stems) but you can't do it with parsnips or carrots. Beetroot can bolt later if planted too early, but you can sow one seed cluster to a module then plant them out at greater spacing and you get several beets growing together, but still with a good shape. I did that last year with excellent results.
For tender beans I usually sow them about 4 to 6 weeks before the expected last frost, or a month earlier in the polytunnel. Courgettes I sow on the 1st of May so they can go out on the 1st June. Last year I sowed tomatoes, cucumbers, and chillies in Feb - they all grew fine but were indoors in a propagator and had become far too big before the beginning of June when I could plant them out. This year I haven't sown them yet, but am working towards it.
Lettuce and other salads can be sown in modules indoors or in a cold frame for early salads but keep them well protected from frost.
If the things you have sown don't work, don't worry - you can always sow more, and if they do work you can laugh at me for being too cautious
