In early February 2019, Agan Tavas had a problem paying cheques into its own branch of Lloyds Bank plc because the cheques were written in Cornish only. The matter was taken up with the bank’s complaints department. There seems to be no problem with other banks in Cornwall and further afield in England.
Those wishing to write their cheques in Cornish or bank staff wishing to scrutinise cheques in Cornish can find information here