You will be able to book your appointment date for 28 days before your visa expires or 28 days before the day of arrival if a spousal visa. You must apply before your visa expires. You will need to check the appointment booking system earlier for available dates as they have booked in the region of two months in advance. See Border Agency information below: Apply to remain in the UK with Family Apply to settle in the UK - ILR Extending your Tier 2 Work Visa