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Hi Wildwood, Thank you for your kind comments, the trouble is that so many people don't want to accept any responsibility when they have done wrong or just made a mistake, that way they never learn from their mistakes and just repeat everything again. My mistake is likely to be a costly one but I will learn from it and not do the same again.
I'm sorry to hear about your son's unfortunate experience, but at least it didn't turn out too bad in the end with your home insurance covering the claim. I wasn't so lucky with my insurance, and has someone pointed out, as I was cycling on a path where I should not have been cycling, even if I had insurance they probably wouldn't have paid out anyway.
Sometimes we learn the hard way, I certainly will!