Former tennis star Boris Becker has told Sky News he was "shocked" by widespread drug use and overcrowded conditions during his time behind bars in the UK.

Becker claimed there weren't enough officers to manage nearly 2,000 inmates at London's Wandsworth Prison, where he was jailed for hiding £2.5m of assets and loans to avoid paying his debts .

The 57-year-old German told The UK Tonight With Sarah-Jane Mee : "Who's controlling who? It's just so overcrowded."

In his new book about life on the inside, he says the "wardens are in charge until they weren't".

He told Sky News: "Mine was a white-collar crime, as they say, but my next-door cell neighbour was a murderer, opposite was a paedophile and on the right there were people smugglers and serious drug dealers.

"Everyone is tog

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