Hi there,
What is known as "Received pronounciation" in the UK is seen as the "posh" way of speaking English. This is how the Queen speaks, and was the way all TV presenters had to speak a few decades ago.
Nowadays, there is no standard accent for teaching children the UK, and there is no authority telling schools they must teach children to speak with a certain accent. Each child simply learns to speak according to the accent/dialect of their local area. For example, children in Wales pick up a Welsh accent, children from Newcastle pick up a "Geordie" accent, children from Birmingham pick up a "Brummie" accent, etc, etc.
What could be called General British pronounciation would probably be the way people from some parts of the South of England speak, people who speak like this are generally seen as having no accent.