Allchins have been built at various scales – some bigger than others in other words. Google should give you some idea of value. It can be thousands.
When I have seen Stuart casting sets for sale they are often retail price less vat and maybe a bit more but they need to be complete with all of the bits and drawings. Their site shows what is included.
Built engines if Stuart generally a lot more than the cost of the kit. You could look on their site to see if they are Stuart designs. Scratch built are generally cheaper. Ebay is probably the best way to dispose of those. Older designs by companies such as reeve's and made from castings are likely to be worth less than similar Stuart models. Ebay is a pretty good place to see what things sell for – just search steam engine with the completed listings option set.
Recognised boiler design with certificate – depends what it is really and I have never seen one for sale but I would suspect pretty expensive.
If you are also disposing of a workshop there are 2 ways. Selling things individually generally raises more money but can be time consuming. Ebay and a photo's of the lot is the quickest way maybe splitting a lathe and kit from a miller etc, If you post photo's on here some one can probably give you some idea. Same for the engines etc.
John
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Edited By Ajohnw on 16/05/2016 11:30:35
Edited By Ajohnw on 16/05/2016 11:38:48