I've just bought one of the Dutch half-wool tops
http://www.endicotts.co.uk/product_info.php?cPath=126&products_id=1250, as littlebiglane and redandshane have mentioned. Its excellent quality (as Dutch stuff tends to be), but I have to admit it was too itchy for me, even though I thought I was OK with wool . If you are sensitive to wool, but want something similar, you might want to try one of Endicotts Italian wool tops in green
http://www.endicotts.co.uk/product_info.php?products_id=1625, which they say are 'Very comfortable to wear unless you have very sensitive skin'. At £9.95, its possibly worth having a go.
I have used the Swedish 'norgie'
http://www.endicotts.co.uk/product_info.php?cPath=126&products_id=1823 (which littlebiglane rightly recommends as a midlayer) as a base layer (as well as a mid-layer), and its pretty comfortable, although not really designed for it. For less than a tenner (and thats if you go for the very best grade), its excellent value.
Personally speaking, I think their French F1 'norgie' is brilliant
http://www.endicotts.co.uk/product_info.php?cPath=126&products_id=1561 - its cotton, and basically a bit like a rugby shirt, but its fine for summer mid-layer, you can wear it without it screaming 'surplus', and its so good my wife keeps borrowing it!
If your ordering from Endicotts, I'd suggest you just ring them and ask for their recommendations - they're extremely helpful.
PS - I've also just bought one of their 60 Pattern jackets
http://www.endicotts.co.uk/product_info.php?cPath=126&products_id=1780 - fantastic quality, and their service was great. Certainly an alternative to an M65 or DPM.
No connection with Endicotts, just the usual happy customer.
Of course, Cotswold currently have the full Lifa set for £30 on their website, which sounds very tempting...