Soldato
They are only holding the heat shield up.Best strategy is to leave it so you get it extended to December and then do the MOT mid-November so you don't waste any of the 'free extension' time you've gained. This is of course assuming you don't feel the MOT needs doing sooner for roadworthiness reasoning (which i guess may be a possibility if you have cable ties holding bits together).
I could just get a few self tappers and drill them into the body underneath then no issues.