Martin LX1 can be had for Circa £450.
Lots to choose from, whats your criteria other than Parlour?
I say because you can go down the Ibanez Acoustic route and get something really nice or you can scoot around Martin/Taylor or many other Brands that’ll cost you a little bit more.
It’s always about the wood and construction methods so invariably it all comes down to £’s you want to spend.
Personally I’d scoot towards a Large Brand like Ibanez (or someone like) and expect to pay £250’ish for a well built and good sounding instrument.
I await to be shot down with this recommendation.. 😆
I have a couple of Terry Packs, he’s based in Liverpool and is a Luther, but nothing shows up on his website for a Parlour otherwise I’d recommend him.
Have poke around on the Internet for large Acoustic UK based retailers, no doubt something on “sale” that might be exactly what you are looking for.