Seems that my Chaucer buy of 26 Feb 2006 has been missed out. It was supposed to have gone through at 4.48pm. The bid/offer price was 100-100.25 as seen on ADVFN.
I think it must have just been too late in the day - we switched from 20 min delay to 15 i think, and do orders would only be processed up to 4:45 - at a guess. I see it went through this morning, 3/4p more - so will leave as is.