Did a trial pack last night.
Tent pretty much fills the saddlebag (it's one of the Argos pro-action tents). I can get my sleeping mat under the flap. Tools, spare inner tube, pump, cafe lock also fit in saddlebag. There is room for odd and ends such as stove fuel in there but not much else.
Sans stuffsack, my sleeping bag nearly fills one small front pannier, with spare gloves and overshoes in side-pocket.
That leaves one small pannier for cooking gear, spare clothes, electronics (phone, battery) maps, wallet and food.
It is a bit of a squeeze.
I could put sleeping mat on top of the front rack. Clothes or cooking gear can then go on top of saddlebag, probably clothes in a waterproof stuffsack.