I may be wrong but I think MrT is able to contact him, judging by a response from him on page 8 of this thread.
Edited to add that I've just messaged MrT, so we may know shortly.
Mr Dracott's views would certainly be a great help in identifying the major differences.
The 1854 no colons penny is decidedly scarce if not rare.
Maybe once or twice a year, an example will present itself somewhere, generally in worn condition.