Some more great oldies there CJ......I think you are right about N88CH
If you didn't see one of these fly (or have forgotten how smokey those engines were) take a look at:
https://www.youtube.com/watch?v=isP1LVVZ6nU
Incidentally, there's quite an interesting blog at:
Aviation Feature ? Luton Airport 1978-1985 | GAR
It features quite a few pics of interesting visitors at LTN between 78-85 including N88CH and the outlandishly painted 1-11 N5LC!