i think you can adjust it from inside the car.
sit in the rear seats and the tail end of the centre console has 2 wee buttons that look like fake rear electric window switches..
1. gently lift them up using flat headed left handed screwdriver
2. that will allow you access to the handbrake
3. using a *i think* 10mm socket you can adjust the handbrake from there.
4. get a cup of tea and drink out of left handed mug and admire your handy work.
Mine did the same at an MOT last month.
Check the self adjustment mechanism on the calipers, mine was stuck plus I had a dodgy cable but could I get the right one? Hell no!
Or the brush things. I had to get them changed on my last MOT and they made a massive difference. The cables or that didnt need changed just the brush things.
What do u mean brush?