Ok firstly thanks for getting back to me....

To answer the following questions....

? did you have you full stretch? -
? did you have you have full strength? single leg calf raise off step and single leg hopping
? did you get back to 95% speed before returning?
? did you complete 95% speed?
? did you have 1 full week of training before your game?

Yes to all!!!

it really did seem fine, but obviously something is not right...

The pain seems to be more centralised to the top of my calf at the moment, whereas when the pain first occurred it was at the lower, down my calf...

the pain is unbeleievable, i am really struggling to walk, although i can... the pain is really bad...

my calf feels solid, and sore to touch

As i am noo physio, all i have been doing for treatment is:

Ice 20 mins at a time
Heat Lamp 20 mins at a time
Ice repeated
then Bath Hot