Work based on another work? Another surprisingly difficult question. The best answer is No (corresponding to the best answer to "originally written in English?"), but a case could me made for Yes (corresponding to the case that could be made for "not originally written in English").

Pseudoscience? Not in any way that I am aware of.
Lord of the Rings? No. (I'm pretty confident that was originally written in English. :-) )

Chalky? Where are you?

[CdM] I thought Tolkien translated it from the Red Book of Westmarch.

[CdM] Sorry - I kinda thought I had the time difference worked out. [and, selfishly, fail to acknowledge that you may have 'other things to do' at the end of a working day].

Written evidence? I'm not sure what you mean. You already know that this is a work of fiction written between 50 and 100 years ago, and that a case could be made for it having been originally written in English.

As to where I was, it is true that your poem question came in before 10pm Singapore time, so on any given day there is a good chance I would be online then -- but not last night, as it happened.

The play's the thing? Yes. *applause*