A3 Battery issue

Hi, This is my first post.

I live in Luxembourg and own an Audi A3 S-Line 3.2 V6. Love the car and had no issue with it (apart from having to get my windscreen replaced due to a stone chip) until last week. Basically my boot warning light came on when I was driving to work. I stopped the car and opened and shut the boot but again the warning came on. The boot definately wasn't open as I made sure. Anyway the alarm kept going off due to this problem and eventually when I tried to start the car I got a horrible vibrating noise and the car wouldn't start. I had to get a flight back to the UK and by the time I got back the battery was flat.

So. My car is stuck in the work car park and I am trying to jump start the car. I opened the bonnet and no battery. I have discovered that it is in the boot, under the spare tyre. However as far as I can see there is no physical way of getting the boot open. I can get into the drivers side with the key but can't open the passenger side from the inside and the boot won't open and there isn't any lock. I have searched everywhere for some sort of boot release catch but to no avail. My handbook is in German so that doesn't help either!

Please help before I have to fork out a small fortune to get the car lifted onto a lorry!!