I can offer some free Manchester parking too - I live 2 miles from the city centre and my building often has at least half a dozen empty parking spaces in our gated car park, the only requirement to be inside the car park would be that somebody would need to be in my flat to let people in, unless my neighbour agrees to do it on her day off (she usually would if she's staying home). Getting out is easy, the gate opens automatically for anybody driving towards it from the inside. On a day that's not a match day with City playing at home, there'll be more parking available around the area, too.