Rehome to Scotland??? I'm in Scotland and every 4th dog that walks through my consulting room door is atopic and suffering!! We do still have pollen here, you know!!
I would agree with others that most atopy is pruritic (itchy), so I'm not sure I'd go down the atopica route just yet. (Have to admit, I've not had great results with it, many of my atopic dogs don't respond, and it is comparatively expensive)
Couple of questions: has your vet given steroids in the past, and if so has it improved things or made it worse? Most atopic conditions will initially improve dramatically with steroid injections, then relapse as they wear off. In my experience food and contact allergies are less responsive to steroids, so it can be a useful experiment. Mange etc will worsen with steroids.
One of the things I would recommend (which you may already have been recommended to do) is give evening primrose oil capsules daily- this can really help the lipid barrier in the skin, and although not usually curative of atopy it can help, and it's fairly cheap and harmless, even if it has no effect. You need to use it for about 6 weeks to get an idea if it is helping. I'd second malaseb, which is really good for yeast and superficial infections. it's not particularly cheap, but you can make it last.
It may well be worth referral to a dermatologist- the initial outlay could be worth it.