It claims to be England's oldest freehouse; not sure how important that distinction is versus "pub," unless it's the whole religious affiliation thing.

There seems to be a suggestion it was "Se Scip" prior to the Restoration in 1663:

https://www.beaconsfieldhistory.org.uk/content/beaconsfield-...

A Freehouse means a pub that is owned independently of the brewery that supplies it. Many pubs are owned by a brewery and rented to someone who runs it (the landlord).

The thing is there’s about 20 pubs in the UK that have a sign on the outside saying “Britain’s oldest pub”