Can't get boot open to get to battery! Help

[Liam79]

Right let me explain. I previously had a loose battery connection on one of the terminals which i sorted and been running fine for months. However, earlier when i went to start there was just a click and then nothing, no electrics.
I opened boot to get to the battery and one of the terminals come loose again. I shut boot and started car fine. Went to get back into it this morning opened fine then went to start and nothing.
Now the boot is locked and wont open with key!

How can i get into the boot to sort terminal?

Is there no way back seats can be removed as i can get into the car just not the boot!

Really annoying

Any help would be great thanks.

[JerseyS2000]

May not work, but try turning the key to the left in the bootlid

Works for my same era M5

[HoagieLomax]

Power it up using the under bonnet terminals.

[Liam79]

Key won't turn, it's like it's stopping it from turning.
Would it jump start under the bonnet even though the connection might not be on the terminal properly?

[TheEnd]

Yea, it'll jump start from the bonnet points, and you should get central locking back.
If not, then oil on the key and a bit of exercise on the boot lock.

[Liam79]

Sorted! Bit of fairy liquid on the key and a bit of a turn. Cheers