XM flat battery

[beemernut]

I've been offered an XM foc, the problem is that the doors only open on the remote (the key has the end broken off it) and the battery has gone flat, as the car has been standing for a couple of months. Any suggestions as to how to get either into the car to open the bonnet or open the bonnet to try jumping the battery so we can activate the key remote. I can't even get a second key cut as all the documents are locked in the car so I only have the reg no, not the VIN.