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In London lived many well-known writer and singer.
There are many museums, theartes, big airport and Trafalgar Square in London.
London is the capital of GB.
There are many old castles and wonderful forests in Scotland.
The unicorn is the national animal of Scotland.
There are many beautiful mountains and wonderful lakes in Wales.
In Wales speak on Welsh and English.
England is the most popular place for the tourism.
There are many steep and rocky coast in Northern Ireland.
In Ireland speak on Irish and English.

Обычно пишут UK, а не GBВ предложении In Wales... по грамматике не совсем правильно построено, начинается всегда с подлежащего, потом глагол, а дальше другие члены предложения, т.е. People speak on Welsh and English in Wales и последнее также