where in the uk is the international hub?

Parcelforce has an international hub in Coventry, where it processes all parcels being sent out of the UK, or coming in from overseas.

Heathrow Airport is often described as the UK's international hub airport.

Birmingham, Manchester and Glasgow airports are all international hubs, but by far the biggest is Heathrow.

The international hub of what?

In general terms, London.

London would be the main city where visitors and business people from other countries visit most. It is the terminus for trains from Europe - London St Pancras International and a number of busy airports.