MAD has been published in the UK since 1959, making it the oldest edition outside of the United States. The British edition borrowed heavily from the US edition, but there were some interesting differences. There were some UK only covers. The UK edition is no longer being published. This edition produced 381 issues, the final issue was published in January 1994. The US version is distributed there now.
The UK edition has been around for almost 50 years. It seems that it was popular. Lots of people grew up with MAD in the UK. Do you have experience with MAD in the UK? Have you read these issues? How was MAD accepted in the UK?