After removing pump from machine I found that the pump head was distorted and cracked

As I sometimes leave machine in van I think damage may have been caused by frost, although not had any for least 1 1/2 weeks.
Sent pump back to Ashbys wednesday. Derek rang me at 9.15 next day to say damage may have been caused by m/c overheating or frost but would send pump head back to Totton for inspection.
New pump head with existing motor back on it's way! £68 for new head.
Derek also advised me to discharge pressure from pump and empty system when finishing a job.
I have to give Ashbys credit for such prompt attention

John Milnes