I think I can see DRE, which could make it:
Alisandre on C, G or GI (Ipswich) or R (Rochester). That would make it John class 5b or 5c.
or
Andrev on London, Canterbury, Lincoln or Winchester. Also John class 5.
There's definiitely a ligated ND, but that wouldn't necessarily help to differentiate between the two. Possibly a C at the end of the mint signature?
So, I'm going for ANDREV.ON.NIC, John class 5, Lincoln mint
Anyone else?