I have never heard of an access plug. However, I can understand they may require you to fit a blanking plug over the end of the washing machine taps. This basically is a blank plug that screws in place of the w/m hoses, and prevents any leaks from the tap.
Search screwfix for item 89113. This one needs a washer too. Nip to a plumber's merchant and tell them you want a cap to go over the end of a washing machine tap.
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