Thank you all, really useful comments and a lot of them are points we've discussed but a few additional ones to think about too
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Yes the back garden is a good size (140' long and 32' wide).
I am happy to paint the loft hatch surround, and will definitely consider repainting the sitting room and bathroom again (but I love the blue!) and will stage the conservatory better, I hadn't thought about it looking like it was a squeezed in work area rather than a space to relax in.
I will talk to the new agent about better pictures of all the rooms, and better angles (I agree the sofa looks enormous, and the 'arty' shots don't really add much value at all to the listing! The new agents also include room measurements in their descriptions so they won't be minuscule writing on a badly drawn floor plan any more either!
The sitting room has an open archway to the conservatory, and doesn't have a separate window, no.
We did wonder if the pond might put off families with small children, but there's not a lot we can do about it now...
As for recent sales, the chalet bungalow was for sale for 10 (?) months at £320k I think, then pulled off, changed to £300k, and still didn't sell for months, before being reduced to £280k and selling about 6 weeks later. The one that went for £270k last year has a similar sized garden to ours and is a similar sized house overall.
The other two I mentioned selling recently were identical looking houses to ours, but still three bedrooms (our fourth bedroom was created on the landing space and is 9' 11" x 7' 8" - it fits a 3' single bed, a chest of drawers and has built in shelves for extra storage - but is a funny shape I agree!)
The two identical 3 beds- one was up for £280k pre-lockdown in February, reduced to £270k in July and then sold within two weeks, and the other sold just afterwards in 3 days (!) after being marketed at £240k but it was original untouched 1950's decor and needed work doing. Both sold for around £5k under their asking price though...
We had four agents value ours (including the one who valued and sold the above two houses, who said ours was in better decorative order plus had the extra small bedroom) and all valued ours between £275k and £285k and so we went for the middle price as we thought that was supposed to be the best idea.
We don't like the 'offers over' price either but we were talked into it...and we will definitely be changing that when we change agents!
Thanks again it's really useful to get unbiased views, it's so hard to be objective when it's your own house!