Greetings John,
Welcome to Hearth.com.
Not sure what your question is actually.....
We sell the Esse's here in North America and would be happy to help you make contact with ESSE in England to find your local dealer.
They may be able to get your questions answered directly, or I can do my best to help you here, if you could just be a little more specific.
I will share what I can......
In my opinion and from my experience, the Ironheart is one of the nicest burning cookstoves out there, that we can get here in the US and is fully listed and tested to UL standards.
I just finished up a You Tube the other day showing the ESSE Extended Wood-box option. After my first test fire using this unit, I was amazed to see my burn times go from 8hrs to over 14hrs!
I have not had the chance to upload the video to my channel, but I would be happy to move to the front of the upload list if you'd like to view the burn.
The video shows the way the stove burns, how tight the stove is and how fast it can achieve a secondary burn. I even discuss stove top fans briefly.
Up here in NW Montana, it can get pretty cold, we run our stoves hard and we don't like to stoke a stove more than twice a day.
The Ironheart is a little on the small side for some of the larger cabins over 1200 sq ft, but it is very efficient and clean burning.
I'm sorry but my experience with the other stoves you mentioned is nill. As far as I know, they are not available here. If they ever are, I'll be there, asking for the line.
The Broseley is indeed an interesting stove in the way the secondary combustion air is pulled in around the door. I would love to get my hands on that stove......The new Italian Broiler is also pretty slick.
http://www.broseleyfires.com/news.php?pageNo=1&page=114
Without actually burning all of the units, it will be hard to tell you which one would be best for you. I will be interested in hearing what your final decision ends up being and how the stove ends up working out for you. I envy the options you have available to you while shopping for a Woodstove or Cooker, in the UK.
You may want to also check out the Razen CS-1at
www.firebellystoves.com
Another line you can have that we are hoping to carry here soon for our US customers.
If you are looking for the biggest bang for the buck in cookers here in the US, I would say that would be the Amish Pioneer Stoves, Bakers Choice. For a few hundred more you can get the Kitchen Queen which is one of the best heating/cooking/baking cookstoves ever built. We can ship these stoves over to you in the UK.
Hope this helps.