Ordered my H about a month ago from Bure Valley - £87.50. Got a call yesterday and paid for it.
On a different note, like many others I'd guess, geared up to scratchbuild an H using South East Finecast body, Bachmann C chimney etc., when Hornby announced these. One problem with the BR versions of the H is that during their lives various fittings (mainly Chimneys and buffers) were not only swopped between locos but used components from scrapped C and LCDR R1 locos as well. For instance, rear buffers might be original larger pattern, smaller front type or the standard Southern stepped buffers, as carried in 1961 by 31324, amongst others.
Chimneys are a complete nightmare. There were at least three, possibly four types (tall, short, parallel barrel and maybe a medium type). Some locos like 31530 in its final days had a stumpy (probably ex-R1) chimney, 31551 in the 1950's had a parallel type with barely perceptible taper which was changed by 1960 to the more common tapered barrel type. I believe that the first batch had parallel chimneys, yet these chimneys might turn up on a later build as they indeed did, later on. Furthermore there were tapered barrel chimneys that clearly weren't as tall as those shown on Hornby's 31308.
My first choice is 31551, my very first railway memory at Gravesend Central in 1961. To this end I have an order in with Rails for a train pack. To produce this loco in its final condition I only need to change the rear buffers, an easy job.
My second choice, however, would be 31324, which had the medium type chimney, clearly shorter than the Hornby 31308 (the original of which may also have had a medium height chimney.) Unless I use a Bachmann Southern C class chimney I'm not sure how I can change this.
I have already let Hornby know of this, obviously too late for them to research the subject further, far too late for them to change the model. I have spent a lot of time looking at H class photos, and please don't take my word for the above, research it for your chosen loco. It's an absolute minefield of bunker, air brakes, chimneys and buffers. After a few days of research you'll feel your head's about to explode!