I recently called out BG to repair my Worcester combi boiler, they sorted it and advised me to have a system flush at a cost of nearly Â£700!! I found some flushing stuff at Wicks for 20 odd and as i needed to fit a new radiator decided to do it myself, after draining my system and re-filling it it wont ignite! the pump is running and i have bled the system but to no avail! And its now leaking outside!! What must i do? Dont want to have to call out BG again! But all i have done is drained the water out and re-filled!! Help PLEASE!!