[AT] fitting glow plugs was Dorman Ricardo diesel engine.

[James Peck]

Richard Dixon specializes in Ferguson and Massey Ferguson? 
https://www.anglo-agriparts.com/tractor-restorers-servicing 

John (JV) Maddock  Down Under AT List member  (mailto:agtronixjv at southcom.com.au); James  This email from my friend will provide some of that info:

[Guy} "Evening John, Not sure of the protocols here about replying to James Peck's query about fitting glow plugs to 23c engines, so I'll reply to you. Otmoor Ironworks in the UK do the conversion. Richard Dixon, mailto:otmoorironworks at gmail.com .  They drill and tap the head and supply a set of glow plugs for about 100 pounds." <snip>