I believe that that’s “mushy peas”. I don’t think they are “mashed”.
Believe it or not, the food in England is much improved. They still have some awful food, but so do we. Try driving across the country and see if you can find good food everywhere. Some good, plenty of bad.
BTW, I used to work for a French company. The joke there was that the best of all worlds was an American job, a European home and a Japanese wife. The worst of all worlds was a Japanese home, a European job, ... and I forget the rest of it.
Everyday British food IMHO is hard to beat as mostly it is fresh meat and fresh veg and only ruined by the skills or lack of skills of the cook.
Many complain about lack of spices or herbs - traditional British cooking uses plenty of both but does not drown the delicate flavour of fish or some meat to extent you cannot taste it. Often highly spiced or herbed dishes in the past were to disguise the fact that the meat was either poor quality or had gone off.
What a tasty treat.
A boiled egg wrapped in bacon, and encrusted in sausage. Then deep fried.
Being a person who once had a gall bladder I recall more than one evening of agony after eating one of them.