Do I need to transfer my ISA funds to a bank account for my O-A visa application in the UK?

Keith Green is seeking guidance on whether he can use the funds in his ISA account to demonstrate proof of financial requirements for his O-A visa application at the Thai Embassy in London. He holds the necessary £20,000 but is unsure if he needs to transfer it to a bank account or if a letter or statement from the building society holding the ISA will suffice. Comments suggest that it is crucial to show that the funds are accessible, with some members advising to check directly with the embassy.