70's British children's TV query

[Padma]

I'm trying to help out a friend here - does anyone remember a British children's (teens) TV series from the 70's where the bad guys (or just weird guys, possibly in full-face crash helmets) would draw a chalk circle on a wall, and then step through it? (nothing to do with The Tomorrow People, we seem to have established .)

[Devlyn]

We had a similar trick on US television with the roadrunner and the coyote. The results were.......tragic.

[Padma]

Ah, but that was all done with paint . I'm talking about real "actors" here...

[Pica Pica]

I can't be at all helpful - but I can be unhelpful - magic crayons remind me of someone I desperately wanted to be...

[Padma]

Penny Crayon, dressed in rayon...

[Janet_Girl]

The Mercury Men maybe

[Padma]

Well, that's set in the 70's but made this decade .

[Devlyn]

Land of the lost?

[Padma]

Land of the lost?

Um, that was a US TV show - this one was a British TV show.

[Lisbeth]

The Beatles did that in Yellow Submarine in 1968. But that was a cartoon also.

[Devlyn]

Padma, it was such an excellent show I thought we may have shared it! Lisbeth, "I've got a hole in me pocket!"

[Padma]

Land of the Lost might well have been shown on UK tv, but the show I'm trying to identify was made in the UK with British actors/accents. A bit more detail, apparently the good guys were the ones doing the stepping through chalk arches (not circles) and wore black full face crash helmets.

[Janet_Girl]

The Banana Splits?

[Padma]

Hahahaha, I think it would take prolonged and strenuous effort to find a show more American than The Banana Splits - Rosan Kobal!!!