Spink sold an array of Ascension in their Philatelic Collector’s Series auction on 26th-28th April 2016, with items from the Stanley Cole collection. The highlight of which was this cover with a 1887 2 1/2d Jubilee tied by a registered hooded circle datestamp, which is one of only two known covers with this cancellation. It was knocked down for £7’000 plus the 20% buyers premium. The other known example was last sold as part of the Vivien Sussex collection for £6’500, although I have been unable to locate an image of the item as of yet (if anyone can help me that would be great!).
Also of interest to Jubilee collectors was this usage of the 4 1/2d value, marked as registered by the sender but obviously just dropped in the post box and not officially registered by the Post Office until it reached London where it was handstamped with “POSTED OUT OF COURSE”. Funnily enough I own a sister cover to this with a 5d Jubilee. I got mine considerably cheaper than the £800+20% paid for this example though!