It has been designated as a Grade I listed building,[1] and a Scheduled Ancient Monument.

[2] Excavation in the 1990s showed that the gateway and chapel had been built on the site of a Saxon bank around the town.

The archway which goes over the former main road takes the form of a pointed barrel vault.

[8] The hanging chapel became a masonic hall in 1891,[1] and is currently leased by the town council to the Portcullis Lodge.

[2] In April 2022, more serious damage was caused when another lorry got wedged in the archway while trying to pass through.