How is electricity distributed across the UK?

How does the national grid work?

What two things are needed, so the National grid can keep voltage high, with current low?

What are the two transformers used for?

What are the two ways electricity can be transported?

Give three pros of using over head cables, rather than underground cables

Give three pros for using underground cables, opposed to overhead pylons

In the future, how will supply be increased?

How can electricity demand be reduced?