I've just visited the Copeman Hart website
http://www.copemanhart.co.uk/index.htm in Britain; they seem to make custom-made instruments only. Their homepage says the following:
"Founded in 1960, Copeman Hart enjoys an international reputation for producing not only the most pipelike sounds but the most comfortable, authentic consoles.
"Our approach to organ building, and sales ethics, has always been more akin to that of the traditional organ builder than to agents or retailers. All organs are individually designed and custom-built in Irthlingborough to traditional pipe organ standards, using many pipe organ components. Consoles are built to match the type and colour of timber in the client's building, and are superior to many pipe organ consoles.
"Our long association with, and research into, digital systems, coupled with our use of the most advanced hardware, means that the software and data that we have developed from within our own resources gives results which are greatly superior to those obtained with cheaper or 'sampled' instruments.
"The philosophy of the company has always been to make the best imitation of the pipe organ. Whilst acknowledging the superiority of a good pipe organ, it is a sad fact that some churches just cannot afford the many tens or hundreds of thousands of pounds sometimes necessary to install or restore a good pipe organ. There is, therefore, an established need for electronic organs at which organists feel at home, and which make convincing pipelike sounds."
But I wonder how they generate the sounds if they are not using sampling. Could they be using the real time sythesising technology? But if they do, how much more can they guarantee autheticity? Honestly I feel the maker should include more information about their technology if they say their instruments are not sampling-based. Then, what is it? Or else, they should set up a audio repertoire played on their organs and include the highest quality MP3 for their potential clientele's preview. So far, I have previewed a few excerpts on Youtube, such as this one on Love Divine All Loves Excelling:
http://www.youtube.com/watch?v=Z0DrKvvA9kw. My conclusion, as far as those videos are concerned, is that it is a South German Baroque tradition, with the addition of Festival Trumpet (or a Tuba Mirabilis, rather) and the like, to make it suited to playing certain English repertoire. But I also notice that the rumbling bass is more of the softer Posaune type than a Bombarde 16'. But maybe it has the latter, too. So it could be a typically large instrument of English stop disposition, that usually contains perhaps the Cor Anglai, French Horn and Clarinet, etc. However, the principal tones and the mixtures and the Cymbel remain those having a heavy slant towards the South German Baroque accent. To me overall, it sounds like it has a style not unlike the Allen organ in its traditional voicing.
And another page in their portal continues: "It is important to note that a Copeman Hart organ does not become obsolete: our digital system is software based, which means we can (and do) continually incorporate the improvements that we make in voicing techniques, not only in new organs but retrospectively in our earlier instruments. Also, as new and faster hardware is developed, it is always compatible with our earlier digital organs. Thus a policy of on-going improvement does not necessitate the development of new 'models' but ensures that every organ we make is able to be up-dated. Some of our older analogue organs (all of which are still serviceable with modern components) have been 'digitised' at minimal cost when the client has wished to take advantage of our superior digital voicing."
This brand is quite new to me, although they say they started their business in 1960. Certainly, here in Hong Kong, formerly a long-time British Crown land (even currently so in parts), we certainly have seldom seen or heard one. It may be worthwhile to investigate further the tonal quality of such brand.