The 'test question' is not available for sending Western Union funds from many countries (including the UK). All that you need to collect the funds from a Western Union agent is proof of identity. However, recipients are asked to provide the 'money transfer control number' if the sender has told them it (which is exactly what you'd be doing if you you scanned the Western Union documentation and forwarded it). Many (probably most) Western Union agents would regard this as a prime form of identification:
http://www.westernunion.co.uk/WUCOMWEB/staticM id.do?method=load&pagename=howToPickUpMT
Chris



