rail network of Wales and England and 5.3% of the population, however the income received from Westminster in 2019-20 was 1.6%. In 2021 there were no electrified lines in Wales. Many major English cities, however, have direct rail connections to Wales. The South Wales coast as far as Swansea is served by the South Wales Main Line which passes under the Severn Estuary through the Severn Tunnel; the West Wales Line connects it to the Pembrokeshire ferry ports. The main north–south railway line is the Welsh Marches Line between Newport and Shrewsbury enabling direct services between Holyhead and Cardiff. An urban rail network, serving 81 stations, is focused on the capital, Cardiff. Mid and North Wales (away from the coast) are served by a limited number of branch lines, some of which connect with revived narrow gauge railways. Roads The M4 motorway, A449, A465, A48, A40, and A477 in the south, the A55 and A483 plus border links in the north, form part of the Trans-European Road Network. Ports Wales has ten main commercial ports. Milford Haven is the largest Welsh energy port. Newport is the busiest Welsh port for iron and steel and Port Talbot is the third busiest for ores. Airports Cardiff Airport is the only Welsh airport offering international scheduled flights. In 2007, Anglesey Airport became a public airport. The UK Government's Treasury has repeatedly refused Welsh Government calls to devolve Air Passenger Duty, as doing so would give Cardiff Airport an advantage over Bristol Airport. Water Dŵr Cymru Welsh Water is a not-for-profit company which supplies drinking water and wastewater services to most of Wales and parts of western England that border Wales. In total, it serves around 1.4 million households and businesses and around three million people - and supplies nearly 830 million litres (180 million gallons) of drinking water per day. Hafren Dyfrdwy is a company providing water and wastewater treatment services, operating in north east and mid Wales. It provides water only in Wrexham and parts of Denbighshire and Flintshire and both water and wastewater in northern Powys. Dwr Cymru Welsh Water employs more than 3,000 people. Government spending and economic management Currency and monetary policy The currency used in Wales is the Pound, represented by the symbol £. The Bank of England is the central bank, responsible for issuing currency, and retains responsibility for monetary policy and is the central bank of