Will the heating system pipes be damaged when we turn the heating on as they may have cracked due to the snow?

the only way you wil find out is if you turn it on, if theinside of the house is above freezing any leaks should allready be evident, listen for any unusual noise from the pump and try to identify any system isolating valve before you start, regards Terry.

Just go through this process ,find a drain off point and make sure it works then put a hose pipe on it,find the stop tap and make sure it works, turn the water off,then run the heating and at the first sign of any problem you can drain it and solve the problem ,or GSI (Get someone in) it wont be too exspensive.

if you are unsure if the system has frozen would be best to get system inspected by heating engineer before you switch it on.

if there are any damaged pipes within a heating system, as soon as the pump switches on water will pump out. have someone come round and see about replacing any damage. hope this helps