Hi Grant, nice to have met you Sat. the chocs are outstanding thanks but I've been put on a on one a day ration!!
Should be £10/ tyre max. try a smaller independent tyre place, they will be glad of the business.
I used the local ATS where I buy my truck tyres from ( in lots of 12) to rotate 4 BFG's and re balance, only to be faced with a £98+vat bill. Guess what I went nuts and they told me that was cheap as I was an account customer!!. Kingsway tyres told me a tenner each tops.
Keep looking.
Andy