Car is gettin retested tomorrow!
However ...I wondered what the limiter valve was that it failed on... Turns out my car doens't actually have a limiter valve.. Interesting. And the guy who looked at my car today saids the brake lines wren't excessively corroded... He cleaned everything up and found the shocker wasn't leaking either. Don't take your car to boro tyres!!!
Getting it retested at a different garage and getting our money back from Boro Tyres...
El x