Darrsi, for once I didn't use massive pipe grips or adjustable, this time just a mash hammer😀.
Seriously, soaked it in ACF50 while still fitted but it's a bit hit and miss to get to. Still didn't move. So afraid the carbs had to come off, drained fuel, then pointed a heat gun at the bugger till it broke free, if you need to resort to the same make sure you pull the adjuster cable rubber sleeve back out of the heat.