Halfords have them for £37.99 which doesn’t look too bad a deal:
https://www.halfords.com/cycling/pedals-pegs/shimano-pd-eh500-spd-pedals-856440.html?cmmmc=Google+PLA--Cycling%3EBike+Parts%3EPedals+and+Pegs--Cycling%3EBike+Parts%3EPedals+&+Pegs--856440&istCompanyId=b8708c57-7a02-4cf6-b2c0-dc36b54a327e&istFeedId=62b447cf-331e-4fec-a47a-9985ff72d404&istItemId=ilalqalwr&istBid=tzwt
Edit - poor search skills
Had seen it, price is great, but weirdly not available for London collection or delivery 🙃
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Halfords have them for £37.99 which doesn’t look too bad a deal:
https://www.halfords.com/cycling/pedals-pegs/shimano-pd-eh500-spd-pedals-856440.html?cmmmc=Google+PLA--Cycling%3EBike+Parts%3EPedals+and+Pegs--Cycling%3EBike+Parts%3EPedals+&+Pegs--856440&istCompanyId=b8708c57-7a02-4cf6-b2c0-dc36b54a327e&istFeedId=62b447cf-331e-4fec-a47a-9985ff72d404&istItemId=ilalqalwr&istBid=tzwt
Edit - poor search skills