London Waterloo to undergo three week upgrade in August - this is how it will affect Portsmouth passengers

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Victorious Festival 2014 on Southsea Common. Pictured is traffic queueing on the M275 into Portsmouth

Picture: Paul Jacobs (142476-229) PPP-140824-032155001

Morning weather and travel: rain expected as traffic builds on M27

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Train passengers travelling between Portsmouth and London have been warned to expect major disruption to services in August while upgrades are made to the railway.

Network Rail and South West Trains have published new train service information for passengers ahead of the work at London Waterloo station between August 5-28.

For more information go to the South West Trains website.