Really sorry to read you've had to shelve your plans for the time being, Kaz
£30K reduction is quite an ask, we'd have done the same as Mick and yourself and said No.
Maybe see what the market is looking like in 6 months to a years' time. If the price of your house comes down, I'm sure the price of a decent bungalow will come down too.
Any decent areas around Gloucester other than Hucclecote? Is Quedgeley any good?