I have been loaned a mini bus which I am taking to London in September, it is a 53'plate LDV Convoy, does anybody know, or is there a web site where I can you to see if it is LEZ compliant.

the transport for london site.
use this page, and the 'by registration number plate' option

http://www.tfl.gov.uk/roadusers/lez/17700.aspx#tkt-tab-panel-3

Thanks Gremlin