As said, Bolands are cocks.

With that in mind, go for a look on Tuesday. Bring cash. Have a decent look at the car, test-drive, check the service history, etc. Get a salesman to invest a bit of time and effort in to it.

Have evidence of similar cars, for cheaper. (So not that 2009 one you posted as it makes Bolands 2011 one better value.) Make a realistic cash offer on it, I would imagine €1200 less than asking with a view to negotiating to €1000. Remind the sales guy that it's cash.

He'll go to speak to his manager.

He'll return with a counter offer more likely closer to €500ish.

Heres where you stick to your guns. Make your offer again. Say that it's a fair offer, especially at straight cash sale prices.

Rule #1; Be prepared to walk away!

Theres a hotel right next door, tell them you are going to be in there for an hour for lunch/coffee whatever. If they change their mind, call you before 3pm or whatever.

More often than not, you will get that phonecall.

If not, pop in just before you leave to go home. Ask if they have given it any more thought...depending on how bad she wants it and how good value it is - take the negotiations up a notch asking for some extras to be thrown in like a new set of mats, or boot protector, or bmw cleaning products, etc.

Rule #2; Be prepared to walk away.