 personally I would take something quite warm if going to such a trip...unlike 0c or minus a little where you can mostly compensate if you made a slight error by wearing everything you've got (and borrowing from friends..) in -20~-25 the Clo values of clothes is less helpful (unless of course you have super down loaded jkt and such) and you could be in a real jam.
I have been playing with layering similarly (30F bag with 45F synth quilt) and I think there is no way in hell that will take you down to -20C
Not sure how you personally balance weight and cost and such but if you are thinking of going the route of buying a proper bag and selling later there is a -40C rated Cumulus (1300g 850FP down) for sale over at BPL right now asking 390USD...
Mike
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I will will have a hire car with me, so weight / bulk no real problem. It's purely for future reference / interest sake. It's -7 here, so one degree lower than last night. I bought Paddy'd 2kg bag off the classifieds and that's tomorrow night's experiment. Then "his" bag + the MM bag. Then I think I may have earned a night in my own bed. My mother is thinking of having the little men in white suits take me away, haha! (this is being conducted on her lawn).
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 Well, I bought a bag off Paddy and that was completely fine at -19c on a downmat and I think the one you've bought has a better spec. Mine is in proper good nick as well, he's looked after it well.
I'd be thinking more about a decent CCF mat or two under a thermarest, a downmat or some such and sticking with just Daimor (?).
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Daimor?? Is that the brand of synthetic bags from years ago?? The bag Paddy sold to FM?? I had a Daimor synthetic bag that was sold as rated down to -20C. I used it in summer through to winter in club huts in UK. Got it after I spent a cold night at -7C indoors with storage heaters in an ancient square shaped synthetic, Summer weight bag bag that was older than I was!!!! Anyway I suvived that and bought this old Daimor bag. It certainly kept me warm in cold conditions and I even slet in it in summer. It was probably extreme -20C rated only. It was 2kg and half filled my 50 litre sack when I backpacked with it. It was however less than half the price of anything close to it in performance which meant as a skint student I could afford it.
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It's a down bag. Bought specifically for this trip.
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Last night: the MMarathon bag inside the Rab Atlas. Smaller, slimmer bag inside the larger, wider bag, should work a treat in theory. Inside a TNova Voayager Superlight. There was a real dusting of ice crystals on both the outside and the inside of the tent, something I did not get the night before as all I had was the outer Rab sheath / bivvi with no tent. Rather pretty and more than I've seen before using this tent - maybe last night's climatic conditions were somewhat different. Fine, warm enough at -7. Wouldn't much care for -10 or lower though, that'd require all my clothes and that would mean being very consticted in the bags. Tonight: the 2kg leviathan inside the tent. My conclusion at present is that the TNova MM bag has only extended my Rab bag by 5 degrees or so.
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Another day, another degree lower. The Paddy Bag is LARGE. Long and wide and volumous. Meaning I can fit another bag inside with ease (!) although I didn't last night, maybe I can get both the TN MMarathon bag and the Rab bag inside Paddy's. Gas Mark 6 here we come! I was pleasantly comfortable but had half expected to be hot, which I wasn't. Forecast this evening is a balmy -1, so I'll give the Paddy Bag and the MMarathon bag together.
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well..if you have a car with you that changes everything doesnt it...
take the heavy bags and you could easily boil 2L~4L of water and put in Nalgene in your sack...
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2 nights without the car. Thinking of booking a bed in one of the wooden huts one the way in and on the way out. £55 a night.
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cant go wrong with a wooden hut...WCS you can burn it down if too cold 
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I like your thinking..... One burnt-down barn to my credit is one too many me thinks. NE Herts has a blanket of snow this evening. This will warm things up considerably.
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