We are not sure what has caused it but we thought it might have something to do with some plumbing repairs we had done last year.
We have had the visit from the plumber and because there is no tick over on the water meter that rules out a plumbing leak so it must be ground water. We will need to do some digging to find the source of the problem.
This is how it looks since last night’s rain. The ground is soft for a depth of about 85 cms.