Have seen this fault with a dodgy (aftermarket) brake light switch - Spent ages going around in circles with this.
You may find if you disconnect the ABS unit that this "fixes" the problem. It seems that some aftermarket switches lack the ability to switch properly.....
However, given you other problems, that this is a red herring? Check for corrosion on the brake light switch, and wet carpets?
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Now offering T4 services in the Fareham area
Replacement keys programmed / supplied / cut
Diesel 135 upgrade available
IPK virginisation and T4 matching available
Sorry, due to a big change in home circumstances, I am unable to do any large jobs at present, but can still offer evening time diagnostics.
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