In reply to Echo_Delta21:
All the options you're looking at would be fine in winter. It's not unusual to see people winter hill running in trail shoes with spikes and plenty people use heavy duty boots in the height of summer. If you aren't planning to climb in them, then your boots wont limit you.
Don't worry too much about the B grades, particularly B1.5, whatever that is. Unless anything has changed in the last few years, there is no standard they are tested against. Size plays a role as well, a size 4 will feel more rigid than a size 13. Choose based on price, fit and what you will mostly use them for. Stiff boots are surprisingly comfortable now, however from what you've written, a more flexible summer mountaineering boot would be ideal and more than capable of keeping you safe in winter. Find some B0-1 boots that fit you well and then get crampons that fit them.
If you end up with a slightly bendier boot, then you will need a more flexible crampon for them and accept that you will put them on a little sooner and more often. With stiff winter boots, you have a sharp edge to the sole and heel and a rigid platform to stand on, which means you can kick steps across a patch of neve, descend on your heels or stand on smaller foot holds and feel quite secure. It makes travelling much faster in the mixed conditions you often find in Scotland. In a bendier boot you wont be able to kick steps as well, wont feel secure in cut steps and will be taking your crampons on and off more.
There are people who would advocate not going winter walking unless you have B2 boots and full crampons. There is some wisdom in that but it's probably a view that's held less now than it used to be. I used B0 boots and bendy crampons to go up tower ridge under powder once. For those conditions on the day, I don't think it made it any harder or less safe. The walk in was nicer and the extra ankle flexibility helped standing on powder covered rocks. Just don't buy bendy boots and then be lazy not putting your spikes on because "it's only a few meters of neve". They wont provide the same level of security as a winter boot without crampons on.