There's a slightly confusing bit in there - the Green Welly is in Chatteris, not Whittlesey
If the Green Welly is jammed with breakfasting audaxers, Chatteris can now offer a Costa/Subway combination at the petrol station next to the nearby roundabout, as well as the Aldi (which might have a pallet of grobags to sit on while eating snacks).
On the High St there's also a bakery, two NISA shops, The Old Bakery cafe near the Barclays bank, and a shop on the way out of town towards Somersham if you've missed all of those.
I'm looking forward to stamping the hundreds of cards at the Green Welly, should be a busy morning