Hi @Lizzie285 ,My initial plan was to head down to Marshalls BMW in Hampshire which is 2 hours away from where I am as they are offering the £500 cashback as advertised by members of the forum and on their website. I’m not sure if the Hampshire dealership is close by to you? If so give them a ring or try ringing your local Sytner to match their offer which I did in the end at my local dealership which thankfully they agreed and saved me a 2 hour journey! Here’s the link for Marshalls Hampshire:
https://www.marshallhampshirebmw.co.uk/news/2020/q3-motability/
All the best.