Another cheap and easy solution would be to drill a hole thru the handbrake lever and the handbrake knob while having the knob depressed and insert a pin thru the hole when you are out to play. So you can just remove the pin when needed.
thats a good idea also, so you saying depress the handbrake button drill thought the handbrake+button then when im wanting to play as you said push a pin thought the hole i drilled to stop the handbrake from latching like is that right ? and sorry guys about my spelling and stuff i struggle quite bad i do try my best for other to read it and for it to make sence sorry guys il just take more time typing now :)
Yes, that's excactly what I meant.
Price for the modification: Next to nothing.
Time spendt modifying: Next to none.
Trouble with the MOT: should be none. (Unless you forget to remove the pin).
As for the language, English is not my mother-tounge eighter, but using it is the best way to learn!