A man accused of being the delivery driver for consignments of amphetamine has told a jury he thought he was transporting glass instruments.

Graham Pierce, 41, of Greyswood Street, Streatham, London, and Kevin Hoare, 46, who runs a scientific glass products company, have denied conspiracy to supply the drug.

Hoare and four others have all denied conspiracy to produce the drug.

The jury has heard how police who raided a barn at Bugsell Mill Oast, in Hurst Green, allegedly found one of Britain's biggest drug producing operations.

They estimated amphetamine sulphate worth about £20m was manufactured over a four-year period.

The jury had earlier heard from Hoare that he had rented out the barn to a mystery acquaintance, who he believed was making medication to treat cancer.

Hoare told the court he had started helping out with making the compound and asked Pierce to make a delivery as a favour.

He was arrested after he delivered a box containing 1kg of pure amphetamine to Pierce's London home in July last year.

Pierce told the court he believed Hoare was delivering glassware.

The box was opened by police as he sat on the sofa. His response was that it was a "fit-up".

The trial continues.