Sounds like it may need new front coffin arms (common problem), drop links (easy job) and a brake fluid change.
Personally, I'd get the car MOT'd by your usual guy. It may well fail on some of the points you've noted (excessive play on ball joints/stabilisers/droplinks) and I think you should expect to buy a car from a dealer that is roadworthy (i.e would pass an MOT at the point of sale).
I'd not worry about the perished bump stop. Some of the rubber suspension components can look a bit tatty/perished but sill work fine.
The aircon fluid may be leaking out of the condensers, hence the noise & oily residue. This means new condensers, which will be a few hundred £ at least so I'd want that sorted by the dealer if at all possible.
Get some mesh grilles fitted when the front bumper is off to protect the rads and condensers in future.
Personally, I'd get the car MOT'd by your usual guy. It may well fail on some of the points you've noted (excessive play on ball joints/stabilisers/droplinks) and I think you should expect to buy a car from a dealer that is roadworthy (i.e would pass an MOT at the point of sale).
I'd not worry about the perished bump stop. Some of the rubber suspension components can look a bit tatty/perished but sill work fine.
The aircon fluid may be leaking out of the condensers, hence the noise & oily residue. This means new condensers, which will be a few hundred £ at least so I'd want that sorted by the dealer if at all possible.
Get some mesh grilles fitted when the front bumper is off to protect the rads and condensers in future.