audit the packaging of a promotional competition within our product

hello, not sure if i'm in the right place... we're running a competition with our product where the packs will have a possible golden ticket. To comply with regulations we need an independent auditor to oversee the packing of products into boxes to ensure the winning packs are distributed evenly. It is a 3 hour job in the next fortnight (date TBC), in Hackney, East London, with a chair and cup of tea provided!