Well I called the dealer where the car had been serviced before, so they were happy to help. Also since I was going to have a PPI done there. This was Town+Country BMW in London.
If you don't know where the car was serviced before, call the dealer closest to you and tell them you would like to have the service records pulled so you can get a quote on maintenance that needs to be done. If you can trick them into thinking you might get the maintenance done there, then they should be happy to help
Then get a quote from your independent and get the work done there.