Many thanks for your response. The sender of the 1st transaction and myself for the 2nd transaction both use blockchain.info I’m assuming that we must use core as the when the transactions failed the 1st time they were both resent within a matter of minutes. How I do check we are using core, and if we are, how do I stop a re-broadcast? One thing that might be relevant - Earlier today just before the transactions were rejected I was asking for help on the forum and others said they were re-broadcasting. Could this be the reason why a re-attempt was made? Thanks for your help
stick to one thread, please. if your tx gets dropped again it'll be returned to the sender for good. that is unless the sender is continuously rebroadcasting it. this happens automatically with core so if the sender is using core ask him to delete the unconfirmed tx.