ChristoT, Christ that's a lot.
My eldest turns 18 in December and has a full licence (restricted jobbie) since August. He has an ER5 and has just been quoted around £200 TPFT for his renewal including business use and pillions. That is with 2 years no claims which does make a difference.
His car is also up for renewal on his birthday and has managed to get a quote for £1500 FC too.