From the London Gazette:
Paralympics.
The design of the said coins shall be as follows:
'For the obverse impression Our effigy with the inscription "ELIZABETH
* II * D * G * REG * F * D FIVE POUNDS * 2012", and for the reverse a
design showing segments of a target, a spoked wheel, a stopwatch and
the clockface of the Palace of Westminster. The inscription "LONDON
2012" appears on the target and the London 2012 Paralympic logo
appears on the stopwatch. On the gold and silver coins the London 2012
Paralympic logo will be printed onto the surface in coloured ink,
while on the cupro-nickel coin the logo will be struck into the
surface. The coins will have a graining upon the edge'.
http://www.london-gazette.co.uk/issues/59938/notices/1456989/from=2011-10-01;to=2011-10-21;all=design+coin
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Olympics.
The design of the said coins shall be as follows:
'For the obverse impression Our effigy with the inscription "ELIZABETH
* II * D * G * REG * F * D FIVE POUNDS * 2012", and for the reverse an
image of the skyline of some of the most well-known landmarks and
buildings in London reflected in the River Thames, with the
inscription "LONDON 2012" above. Surrounding the skyline image is a
selection of sports from the London 2012 Games with the London 2012
logo at the top. On the gold, gold-plated silver and silver coins the
London 2012 logo will be printed onto the surface in coloured ink,
while on the cupro-nickel coin the logo will be struck into the
surface. The coins will have a graining upon the edge'.
http://www.london-gazette.co.uk/issues/59938/notices/1456986/from=2011-10-01;to=2011-10-21;all=design+coin