Problem with photocopies is that they can be prone to some photoshop type action these days, especially with the advent years ago of the all in one printer units that you can now get very cheaply. I certainly never accepted photocopied passports at the establishments I worked at.
Driving licence is always a good one lads, even a provisional if none of you drive if you have the time to apply & get it done. Bith certificate isn't photo ID either so I would no no that as well on its own.
As for the 'prove-it' cards I never liked them as again they are easy to fake. The goverment approved ones that had leaflets in most pubs, bars & clubs had an orange frontage & the card itself was a light grey in colour. CAN'T FIND A LINK !!!
However this was quite a good website :
http://www.thesite.org/travelandfree...al/proveyourid