...so did you try mailing its author, Paul Hogger? His Email is at the top of the file.
If so and got no response/bounced, did you try asking on the NESWorld forum?
https://www.nesworld.com/forum/If so and got no response, did you try contacting Acey/Martin via Email and ask him if he has such? His Email address can be found on the main website.
If so and got no response, then you're going to need to spend a few hours going through each entry in the file, looking up each game on the web and see if you can find the EU/GB release date for them.
https://en.wikipedia.org/wiki/List_of_N ... stem_games is a good starting point, but as you'll see, there isn't a precise date for each game in EU due to bad record keeping and the like. In this case, you're tough out of luck.