Lovely example of Atkin's work.
EC Hodges was a very high grade actioner to the London guntrade and so may have been the actioner who put the basic gun together for Atkins or it may refer to the ejector mechanism that Atkin favoured at one time.
If the latter, it is unlikely to still be the Hodges ejector mechanism which is famous for its unreliability and was almost universally replaced with a something more mainstream and reliable.
Atkin Grant & Lang will supply you with a copy of the ledger page that refers to the gun but don't hold your breath, the information is often very scant.