So I've spent the last few days recovering from that (oddly I never felt ill, just flattened), gradually increasing my intake, and I'm now ready to fast again.
Breakfast today was an extra large poached egg on a small slice of Hovis Best of Both bread with 150 ml of V8 juice, for 190 calories. I love V8 juice, so tasty and low in calories, and surprisingly filling. Lunch will possibly involve prawns and salad.