The squiers actually have an ok sound if you intend to just twiddle/bash about on it. I've never tried an affinity model but I don't think they compare to the standards, affinitys are usually sold with starter packs & standards for seperate sale.
With that said, there is always room for improvement. Put some Seymour Duncan SPB3 quarter pounders in there, they sound pretty good (IMO) My friend placed them in his Pewter Squier Precision & they were a huge step! or EMG select (if you don't wanna spend all that much)
congrats on what you bought, £70 a cracking price.