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Decathlon do (used to?) a lightweight decent quality fill down bag, sure its now mountain hardware, but they retail around £90-120. The one i've got is 910g on my scales and I think comfort to 0C and survival to -5C. Its not full size though, i'm 5'9 and I wear it like a sock. Cost me about £10 in their sale. Has a really well thought out baffle too.
Force Ten in 2014 model range had some really really competitive down bags but you might struggle to find them, price since then has gone through the roof for the stuff (I remember it increasing by like 80% in a 3 month period in 2013) so newer bags will be more money.
I've always been a Trangia man. You can do so much with them.
PROTIP: if cooking pancakes, use the saucepan upside-down. Works lots better than the frying pan.
On this note, I went to the outdoor shops in Covent Garden today looking for a summer sleeping bag that packs down nice and small. Was prepared to spend a couple of hundred but the choice was distinctly underwhelming from North Face/Cotswolds/Ellis Brigham etc.
Basically Looking for something suitable for the UK summer (down to, what, 7 deg?) that packs up as small as possible. I have a 4 season thing that's quite old. I can't remember the brand but it's got a Norwegian flag on it. Really warm bag but and quite bulky but by comparison to what I saw today it was positively svelte.
EDIT: my current bag is a Nanok