Bit surprised that TWO valves aren't glowing. The U25 shouldn't be lit but the 30P4 (line output pentode) and U191 (boost diode) in the LOP can should be.
The failed cap sounds like a heater chain decoupler. My schematic shows 3, each of 1nF, around the LOP valves. Since octal valves have their heaters on pins 2 and 7 this is probably one of them. Can be safely left out for now. Have to say that I don't think I've replaced them on my set so I'm probably storing up trouble for later. A failure in one of these caps could blow a valve heater.
Suggest you download the TCG316 data from
http://www.thevalvepage.com/tvmanu/ekco/ekco.htm This iwll give a chassis layout. While it's not 100% correct for a T311 much of it is relevant.