Joye (and everyone else) I'm really sorry but I was looking at the wrong brooch!! I wondered at the time why there was so few events! I accidentally filtered for the "diamond double bar" instead of the "double pearl triangle" (my excuse is I was feeling a bit poorly last night!)
To compensate, here is my list of this pearl brooch appearing since 2007:
05-May-09 - Royal Botanic Gardens, Kew, 250th Anniversary
23-Apr-09 BP - Black Rod, outgoing
27-Oct-08 - St James Pal - reception for Leonard Cheshire 60 years
27-Jul-08 - Crathie Church
17-Oct-07 - Pool of London, name Trinity House Vessel GALATEA
23-Jul-07 - BP - Order of Merit: Lord Reese of Ludlow
19-Jul-07 - BP - Ambassadors - maldives
17-Jun-07 - Polo Queen's Cup
30-May-07 - BP - Dignitaries, Nova Scotia
02-Mar-07 - BP - ambassadors - Peru
15-Feb-07 - -BP - Tea for Arsenal FC