National tyres wheel alignment

I know that my tires are starting to get worn inside ( advisory on my mot ) and for £15 i want to squeeze a few month from the tires but i am afraid that they will damage my car...
 
Protyres has the hunter wheel alignment and they charge £31 for the front, i can not adjust my rear.
So one tire will cost me £90.00 with balancing and i need two. Do y go for the £31 service and change the tires in maximum 2-3 moths or just wait 2-3 month change the tires and do the alignment then ?
 
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