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woofgang, I think you were absolutely right.
Although, where you say "negligence by a solicitor is immediately grounds to overturn a will" - that's 2 different issues, not related at all OTHER than the negligence issue was suggested as a possible way of funding the defence of a court case where the eldest son is contesting the will. As I said, it's probably unlikely the case would go to court, & *if* it did, the eldest will almost certainly lose - he has NO grounds to contest it & his solicitor (who's in no way related to the will, probate, etc.) is regarded as only being interested in his fees - so he would have to pay all the costs anyway, we're told upwards of £50/60k.
There is, obviously, an awful lot more to this than I've said and although my oh knows I've posted here, it's not my place to go into any great detail, particularly when it isn't really relevant to the original question.
Oh, and it would be my oh's solicitor going to the "will" solicitor saying "you could be negligent / pay my client's fees / but you'll probably get them back as he'll win" :)