If you part ex yours you'll get way below the market value . I was offered £4000 to part ex my 172 , i sold it private on autotrader and got £5900
Sell yours private and try and buy private as dealerships will want top dollar for their cars .
Car supermarkets , dealerships are business's so they are in the market of making as much profit as possible .
There aren't any new 182's about anymore . They stopped production in October 2005 .The newest you'll get will be either a late 55 plate or the odd 06 plate .