This is an original poster for "Caveland" in Great Yarmouth, which opened in 1956 and closed the next year. But it's more than that. It's stuck onto at least one older poster for the Wellington Pier theatre and using my somewhat limited skills I've managed to enhance the older poster as you can see in the third pic. Vic Oliver died in the early 60s and Terry Scott was in "Great Scott it's Maynard" in the mid 50s, so this poster is probably from around 1956 too.
 
Somebody with good restoration skills might be able to separate the two posters, but I'm not going to try, so they come stuck together - you're buying the Caveland poster and what you do about the other one is up to you!
 
Approx 30" x 20" unframed. However, it's framed in the shop and on sale framed at £55, but could be posted unframed and rolled in which case the purchase price would be £40. Condition reasonable for its age, but edges tattered and some tears.