The solicitors are not completely correct nor other land registry.
If it was joint tenants, then the property would pass on the death of one of the joint tenants, to the survivors and you and your husband would then own the property still as joint tenants on an equal basis. If he or you then died would pass to the survivor. There is no need for probate and what you were told by the land registry in those circumstances is correct, you just send the death certificate and form AP1. What you were told by the solicitor is wrong.
However if the property is tenants in common then the share of the deceased passes in accordance with the deceased will (or intestacy if there is no will) and probate is required. So in this latter scenario, the solicitor is correct and the land registry is wrong.
The land registry don’t often get it wrong and I imagine that they were not aware that it was tenants in common.
The solicitor is wrong however by saying you always need probate because that’s not the case.
Can I clarify anything for you?
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