I think the last one I got was 30 quid and Andrew Ambrose responded. That was 2011.

My doubles came with ledger details. Although I did correspond with H&H about the extra 375 Flanged Mag barrels with my 500/450 3 1/4" Royal and they confirmed they made them but couldn't give much more detail than that. From the shop number on the forend lug it matched the range in the 1950's.