Ben Gumpert, prosecuting, told the court Mr Evans, a welder, had constructed the false compartments.

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Mr Gumpert said for "different reasons" the other two in the group are not on trial.

BBC: Teenagers shot dead in Milton Keynes 'drug turf' dispute

Prosecutor Ben Gumpert said the 18-year-old's body was found two days later at Woburn Golf Club.

BBC: Rachel Manning 'strangled and dumped at golf course'

The men were seen arguing with the two victims moments before two shots were heard, Mr Gumpert said.

BBC: Teenagers shot dead in Milton Keynes 'drug turf' dispute

Mr Gumpert said the case was "complicated" because Miss Manning's boyfriend, Barri White, was convicted of her murder in 2002.

BBC: Rachel Manning 'strangled and dumped at golf course'

Prosecutor Ben Gumpert said Tommy Connors Sr was the boss who drove the workers "like slaves" often until 21:00 on cleaning and painting jobs.

BBC: Beds, Herts & Bucks

Prosecutor Ben Gumpert said it was likely that the three defendants knew the victims and were part of a group of five, two of whom were not before the court.

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Mr Gumpert told the jury one of the workers lived in a horsebox with 10 others and the only washing facilities were a cold water tap in the yard and a shared toilet.

BBC: Beds, Herts & Bucks

Mr Gumpert said the defence would argue that there was no servitude, no forced labour, but rather a rough bargain which enabled men who would otherwise have wasted their lives away in drink and dependency to have meaningful lives as part of the Connors family.

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