Exhibit 23.3

		BDO Stoy Hayward LLP		Arcadia House Maritime Walk
		Chartered Accountants		Ocean Village Southampton SOl4 3TL
				Telephone: +44 (0)23 8088 1700
				Facsimile: +44 (0)23 8088 1701
				DX 2008 Southampton
				Web site: www.bdo.co.uk
Private and Confidential				By email
Commonwealth Biotechnologies, Inc.				29 January 2008
Richmond, Virginia
				Our ref: 014171/JDS/T259
				Direct line: 023 8088 1907
				E-mail: jonathan.shaw@bdo.co.uk

Dear Sirs

Consent of Independent Registered Public Accounting Firm

We hereby consent to the use in the Prospectus constituting a part of this Registration Statement of our report dated December 19, 2007, relating to the financial statements of Exelgen Limited (formerly known as Tripos Discovery Research Limited) which is contained in that Prospectus.