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Sorry I had not put full information in. I do not actually owe any ground rent.
I recently received a bill for this year's ground rent and promptly paid it online the same day. However the day that I received it was almost 3 weeks after the date on the invoice and about a week after the due date. It was also postmarked almost 3 weeks after the date on the invoice.
My worry is that I'm concerned that the person that I pay ground rent to, may have regarded me as being late even though it was delayed in getting to me. And they may have written to the bank - are there rules about when they can and cannot write to the bank? ( have written to them to let them know and asked for their position but no reply as yet)