A wayleave would be registered on page 4 of a standard folio. You can request same from the Land registry or your solicitor should have a copy.
If its not on the folio then whatever other arrangement that might exist is not attached to the property .If it were on the folio and you tried to sell your property the purchasing solicitor would likely highlight this fact to the buyer and it could be a game changer for the purchaser.
If its not on the folio and no other contract was grandfathered in when you bought the house then you could try charging the company rent or negotiate free services from them.