Sorry to hear about that mate,
give this number a call and he will get the part over to you asap and cheaper than Camskill.
07853355415
Before that, get a picture of the remaining pulley on the engine, i suspect it is the one connected to the water pump, the water pump may also be damaged now, post the picture on this thread, if you dont know how to then get in touch with Nick (administrator) he will help you to get it posted.
Then i will take a look and help you as much as possible trying to save you money and head ache right now.
El