The £350m number relies on UK Treasury’s estimate of the gross amount the UK contributed to the EU in 2015 (£17.8bn = £342m/week). Britain’s 2015 EU budget rebate was £17.8bn – £4.9bn = £12.9bn (£248m/week). Deduct both the rebate (£4.9bn), which is never actually paid, and the money that is paid but sent back (£5.8bn), from the gross £17.8bn annual “membership fee” and you arrive at a net figure of £7.1bn or £136m a week. The rebate is deducted BEFORE any payment is made, so the £350m is wrong. I don't harbour any love for the EU and sympathise with many of the arguments Leavers made but I also expect positions to be represented honestly.