In the Midlands, a rough guide (in reverse order) is:
3) Parking £1000 to £1500 at an airfield with hard runways or perhaps half this if grass.
2) £1500 to £2000 per annum
3) Look at your piece of string ! However, talking to a licensed engineer will give you some sort of idea.
If you look at pfa permit aircraft, then the figures drop significantly for group 3.
I'm treasurer of a long-established group of six people flying a 2-seat pfa taildragger hangared at a grass airfield in the midlands. The figures for our group are:
share price: £2500
monthly standing charge: £37
hourly charge: £6 per hour (take-off to landing) dry.
We buy our own avgas which adds about £18 per hour and leave the aircraft full for the next member to fly.
At a rough guess, a PA28 will cost you more.