i go to Warsaw for 5 nights, airbnb and a whole apartment to myself, and i got in relatively early for flights so much better price than they're at now, and it'll still probably be cheaper than the weekend in Manchester when you factor in all the other things like fuel, parking, socialising.
I do a lot of socialising in Warsaw but still much cheaper, and ok i get a lift to Heathrow so no airport parking etc, but this country has a habit of just overcharging on everything