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Do not do this ^^^ they shall just get cooked into the block,and when you do manage undo them all the crusty bits drop into the block and sit on your pistons!!
Which in turn causes scoring and a fubared Cat when it gets all those nice copper bits stuck in it
Halfords plugs and leads won't be any better and shall cause the same problems you have. Although i think halfords do sell the ngk pfre-10 plugs but don't hold me to it
As Budgie said it's up to you!
I would recommend it but that is because mine failed on me, it is rare for them to go though. I would say 5l coolant (type -d), waterpump and labour would come in around £90ish on top of the belt price etc.
No 172 and 182 inlets are different. 182 inlets are pretty well matched from the factory look for the "R S" stamp on the lower inlet once you remove the fuel rail guard.
This indicates the better matched inlets