Hi lanky, do you have a microwave in work? I make poached egg on toast for brekkie in work 4pp and really filling, sometimes I push the boat out and have some bacon medallions too, you can have 2 for 1pp so that's still only 5 in total.
We don't have a microwave at home so I bought an egg poaching thing and a bacon crisping plate and just keep them in the office kitchen and then they're there when I want something filling.
I start work at 8, leave about 7.15 so I have brekkie in work each morning so I'm not too starving by lunch time!