Here's the valve line up, all Mullard except the one on the far right which has no markings at all.
Date codes are 1957 and 1958, Blackburn factory except the EM81, re-badged Philips made in Holland. This would suggest they are the originals supplied when purchased.
The un-marked one was in the ECC83 socket and looks like the "long plate" version. Mullard made long plates up until 1959. I'll start a thread on the components and circuit forum to try and identify it, who knows, it could be worth 5000 quatloos on the planet Triskelion
