On Monday 4 September only following weekend engineering work- Hammersmith and City line trains will run non stop through Paddington, and Circle line trains will call at different platforms to normal (Platforms 1 and 2 on the Praed Street side of the station, rather than the shared platforms with the H and C).
But don't worry where those different platforms are, everything will be signposted and staff will be on hand.
Over the weekend of 2 and 3 September a special joint Circle and Hammersmith & City line service will run from High Street Kensington to Barking via Victoria instead of the normal route.