The AW-139 is being bought for the coast guard role anyway, and would seem to be the right sort of size, and very importantly, price!

No it isn’t. Well not as a permanent solution. The permanent solution, UK SAR-H, is still a tender.

They will go ahead, mark my words. 🙂

The Storm Shadow and the Scalp EG are 99% the same missile, it wasn’t a case of the UK storm shadowizing the Scalp but both codeveloping a UK/French missile. The Scalp for example also uses the BROACH warhead and TERPROM navigating system.

Do you know how many prototypes have been built? What did they weigh?

There are basically three versions, Herti-1D, Herti-1A and Herti-1B. However, iirc only the Herti-1A got developed further.

Check this link out, I wrote this to a large extent on Wikipedia.

Link.
http://en.wikipedia.org/wiki/BAE_HERTI

What is not said in the page is that Flight International once reported that BAE Systems wanted to build ten prototypes. Considering that they are sending 3 HERTIs to Afghanistan (one’s already there), I think that is probably the correct number, because they still have some work to do imo, for other versions under consideration etc… .

Why? Caesar is being developed for the Typhoon.

CAESAR is currently only in prototype form, there is a big difference between fully developed radar and prototype.