You could try to contact them to get your passport returned.
http://www.ukba.homeoffice.gov.uk/ab...-of-documents/
To request the return of documents from any other application for permission to stay in the UK
Phone: 0870 606 7766 and select Option 2.
Textphone: 0800 389 8289 (the contact centre also accepts calls by text relay and other similar services)
The email address below is for applicants who are already in the UK and require general information about the Immigration Rules' requirements. For data protection reasons, we cannot answer questions about individual cases by email.
Email: UKBApublicenquiries@ukba.gsi.gov.uk
Address: UK Border Agency, Lunar House, 40 Wellesley Road, Croydon, Surrey CR9 2BY
Opening Hours: Monday to Thursday 09:00 to 16:45, Friday 09:00 to 16:30 (excluding public holidays).
