The image below shows the two side by side, the one on the left from the NY Times and the right from GCHQ. There is a slight difference in the style of writing, i.e. more sloping to the right in the GCHQ image. There are also some word differences: word 7 is GOVFN from GCHQ and FOVFN in the other.
That the message was found in Bletch***ing***ley, Surrey may be a bigger clue.
I believe that the key lies in the final 6 number 1525/6. In this period the German Mathematician Albrecht DÜRER published "The Four Books on Measurement" the third of which picks up on the geometric construction of the latin alphabet. Albrecht DÜRER was also famous for a magic square which is the same as Sudoko puzzles and would therefore have the intelligence and ability to work with alphnumerical codes.
It may be a long shot, however it also seems very coincidental. It may be that the key to the code is one of his books and that 27 is a page reference to one of is publications such as "The Four Books on Measurement" which were released in 1525.
Not a solid answer but a path worth following.
In principle even a one time pad isn't unbreakable if the pad is a short sequence that is repeated. If that were the case then a brute force search comparing each output message with the statistical likelihood of that message existing in English should yield an answer.
Seems that we really need to know more about the encryption methods that may have been used to produce this message.
Even if it is a one time pad and one that that is not repeated, if the pad was taken from a commonly available book (say) then once again a brute force search may be possible (in principle) using the same maximum likelihood approach. The only completely hopeless case is if the one-time-pad is not repeated and no longer exists anywhere.