Help me!!!!

I am trying to Identify a helmet I just bought. It's a british helmet with the date 1942 stamped on it in the inside, as well as the lettersC.L./C. and the number 78 below that. The halmet was a wide brim and covered in camoflage mesh. on the front is a red triangle. The padding on the inside is in a t-shape with a black leather thing (forget what the word is) surrounding the inside. The helmet strap is a nylon-ish type with springs attatched and covered at the sides of the helmet for stretching.

The most interesting part of this helmet is the scribbled name Seymour on the strap.

Even if you have no clue about this helmet, maybey you have a good info site for me.