Not quite ESB grade, here's my recipe for an Ordinary Bitter. It recently scored a 37.3 (first in its flight) in a comp in Philly. I suppose you could scale it up to make it an ESB.
92.3% Maris Otter
7.7% Crystal 120
15.1 IBU East Kent Goldings 60 min
11.5 IBU East Kent Goldings 30 min
6.0 IBU East Kent Goldings 15 min
1 pkg Safale S-04 (rehydrated and oxygenated, of course)
Mash pH: 5.26
Using gelatin to clarify, this beer went grain to glass in less than two weeks and it was crystal clear.