A few hundred pounds well spent with an advisor would set you at ease. I know of at least one case in a country with a similar tax regime where the unfortunate individual had his funds deposited after he arrived in country and as a result the money was considered as income in that year. That attracted a 55% tax rate. One surefire cure: park yourself somewhere outside the UK until your funds arrive in the UK. If you follow the funds in and declare your tax residency from the day of your arrival there will be zero tax owing.