Schwalbe K-Guard winter spike 700c x 30 is £15.99 at chain reaction: https://www.chainreactioncycles.com/schwalbe-winter-spike-road-tyre-k-guard/rp-prod118113
I've not used this particular tyre but the 'Marathon' version are great.
Do you actually use them? I'm guessing you're UK based. I'd imagine there are only a couple of days a year that need a spiked tyre.
@Tonts started
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Schwalbe K-Guard winter spike 700c x 30 is £15.99 at chain reaction: https://www.chainreactioncycles.com/schwalbe-winter-spike-road-tyre-k-guard/rp-prod118113
I've not used this particular tyre but the 'Marathon' version are great.