[Closed] Car tyres Bargaintastic advice ( not cheap cruddy tyres)

I have been using Prestivo tyres on the front of my Picasso for 20k miles on a 185/65/15 and alas mrs SD hit a pot hole and blew the tyre out. I checked the warrentee and found this below

Prestivo Accidental Damage Guarantee.
This tyre is guaranteed against accidental damage - that means if you damage it and we cant fix it we will give you a discount on your replacement tyre of up to 100%.

The discount is based on the unused portion of the tread, so if the tyre is unworn you get 100% discount, 50% worn, 50% discount. 90% worn 10% discount. Simple!

Prestivo is made by a leading manufacturer and combines great handling especially in the wet, with class beating durability....Check Size Availability

Tread Remaining Discount
8mm............100% allowance
6mm-8mm....75% allowance
4mm-6mm....50% allowance
2mm-4mm....25% allowance
below 2mm....nil allowance

Returned to the tyre dealer, [b]no quibble replacement tyre £15 [/b]

These tyres ar £56 each which is £35 less than equivelant mitcheline's (which at 20k are knackered) and should be good for 40k+ and I have never had any grip issues with them so perhaps [b]Cheap tyres can be good[/b]