Mr McKinnon was only diagnosed with Asperger's syndrome in August 2008 and, as a result, it was not taken into account in legal proceedings prior to that point. The judicial review represents the first opportunity to consider his Asperger's syndrome in relation to this case.

As the National Autistic Society has testified, people with Asperger's syndrome can be particularly vulnerable because of their social and communication difficulties, and are susceptible to additional mental health problems as a result of their disability. The effects of extradition and incarceration abroad could be devastating.

This is a case with political and legal implications. It is about how conditions like Asperger's syndrome are recognised in this country and how those with disabilities are protected from undue harm within our criminal justice system.

It is vital that the Government intervenes to protect a vulnerable citizen and let him be tried in the British courts. We urge the Prime Minister to take action.

Lord Archer of Sandwell
Lord Clement-Jones
Baroness Linklater of Butterstone
Lord Maginnis of Drumglass
Lord Morris of Manchester
Lord Thomas of Gresford QC