H1B travel to UK with expired visa stamp and valid I 797 in Travel Posted January 11 · Report reply I have an expired H1B Visa stamp but a valid I 797/I 94 until 2021. I wish to apply for UK Visitor visa from USA. Is a valid US visa stamp absolutely essential for applying for UK visitor visa? I do plan to get my H1B visa stamp renewed in Canada/Mexico before my travel to UK. This question is primarily about the UK visitor visa application.