Peter Prinsley says he carried out testing on the River Lark, finding high levels of ammonia.

An MP said he feared a river could be toxic to fish after carrying out water quality testing himself.

Labour’s Peter Prinsley, who represents Bury St Edmunds and Stowmarket, says he carried out tests on the River Lark - finding dangerous levels of ammonia.

Prinsley said: “This kind (of pollution) is often linked to agricultural runoff or sewage discharge.”