[MorganLamia]

That ninja censorship stopped being a real problem before TMHT's original run finished. Power Rangers had no problem mentioning Ninjas in 1995, the year before Turtles finished.

Although interestingly the 1997-1998 (US dates - the UK airings were possibly 98-99) live-action Turtles show (also made by Saban, the same as PR) was originally titled "Ninja Turtles: The Next Mutation", but like what happened with the cartoon in the UK, was re-titled as "Hero Turtles: The Next Mutation", complete with an re-worded opening theme song, logo and other on-screen text to replace the many "ninja" mentions.

Ninja Turtles:
www.youtube.com 

Hero Turtles:
www.youtube.com 

A little strange since that was long after the "ninja" sensitivity had died down.
As a side-note, that same live-action Turtles show had a crossover with 'Power Rangers in Space' at the time in 1998. When they aired it in the UK (was very likely to be 1999) they edited out the "ninja" part of their name there too. I'm guessing for consistency. Well, kinda. They literally just chopped out that part of the audio instead of replacing it with "hero".

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