I read with surprise your assertions in the article “Illegal T5 Worker Deported” (20 April, page 11).

Terminal 5 has some of the strictest safety and security procedures of any construction site in the UK. Because of this, from a total of 45,000 workers employed at T5 since construction began in 2002, less than 0.01% have been found to be working illegally or in breach of their immigration status.

The discovery that this worker was in breach of his work permit was a result of the audits and checks we undertake regularly in partnership with the control authorities, and demonstrates just how robust and successful our procedures are at T5.

Andrew Wolstenholme, BAA project director, Terminal 5