Okay, So if I upped the budget to £250 - £300, what would be best?
I quite like the look of the Rab Neutrino Endurance 200, but what are the competitors?
Since you are looking at the RAB Neutrino 200, I'm assuming you are looking at three season sleeping bags with rating down to about 0C, since the Neutrino 200 has a rating of 5C.
In that category bag, I would look at the:
1. Feathered Friends Osprey Nano 30 (or any of the other 30 degree variants from the company like the Merlin or Kestrel), which weighs 784g, has a rating of 0C, and costs
£220;
2. Western Mountaineering Summerlite (or HighLite), which weighs 525g, has a rating of 0C, and costs £225;
3. Mountain Hardwear Speed 32 which weighs 446g, has a rating of 0C, and costs £285;
4. Marmot Plasma 30, which weighs 680g, has a rating of 0C, and costs
£285;
5. PHD Minix (or Minim 400) which weighs 590g, has a rating of 0C, and costs £199.00;
6. You may want to also look at the Valandre Bloody Mary. It is a heavier bag, but some people like its modularity.
I don't think you can go wrong with any of the above bags. I'm a Western Mountaineering fan myself, but I think any of the above are comparable. Read some reviews for each bag you are thinking about and see what people like and dislike about them. Something that might be very important to me, may not matter to you.