Supposedly, Airfix said that the kit was a limited edition, and that they wouldn't re-run it.
Then, someone had a clever idea and they modded the moulds a little and released it as a Japanese anime version (but cleverly this had all the original parts in it ! )
Stratos 4 TSR.2MS
Published: October 2nd, 2011 Space & Sci-Fi Vehicles Kits
Reviewed by: Mike Hinderliter - IPMS# 45124
Product / Stock #: A08011
Product provided by: Hornby America
... The ground-based meteor sweepers use the TSR.2MS aircraft that is based on the British TSR-2 from the 1960s with a few changes. Airfix has done a really nice job of adding another sprue of parts to include these changes with their original kit. Another plus is, if you aren't into Japanese anime, you can also build the Airfix TSR-2. All of the original parts are there, including the decals and instructions - that's right, you get both sets of instructions. This is definitely a win-win from a marketing aspect. ..."