GolamMostafa:
I have always thought (that) the English in England was a bit hard to understand.
Presumably you are now referring to spoken English rather than written English.
One needs to attune one's ears to the local accent. I'm Irish and I was at a business meeting in Texas when one of the experts that we were visiting arrived late due to a delayed flight. Having got used to US accents I could not understand the newcomer for about 20 minutes until I realized he was speaking with a Scots accent. Then there was no problem understanding him.
...R