I guess you may have seen this website..... something of a one stop site for all things Imp.
http://imps4ever.info
Plenty about the 'Emery GT' there too if the interest is in not exclusively.
A specific section re Emery as well
http://imps4ever.info/tech/tuners_builders/emery.html
plus dont miss:
http://www.imps4ever.info/racing/races/
Beware, they are not all Emery Imps in the pics, as it covers all of the major tuners. Many of the pics (and info pages) are of the Fraser Imps, Bevan, McGovern, Hartwell, Macguire etc. And because it is mostly early / mid sixties stuff then colour is not the first choice of medium.