ConocoPhillips refinery, BP Cats, Harvest Energy Biodiesel unit, Greenery Fuels, Fine Organics, Vertelus speciality chemicals and Ineos Nitriles are all based at Seal Sands, with Vopak and Simon Storage tank storage businesses nearby. Air Products are building two waste to energy units at Seal Sands, and Sita are upgrading their unit at Haverton Hill. Marlow Foods produce Quorn, and KP Snacks make McCoy's Crisps in Billingham. Santander UK's mortgages division is located in Thornaby. Tetley Tea have had their only tea bag factory in the UK at Eaglescliffe, in the borough of Stockton-on-Tees, since 1969. It is the largest tea bag factory in the world and makes 18 billion tea bags a year. Its distribution centre is at nearby Newton Aycliffe in County Durham. Teesport Teesport is on the River Tees and is currently the third largest port in the United Kingdom, and amongst the ten biggest in Western Europe, in terms of tonnage shipped. Its size is due to the local steel and chemical industries. This port handles over 56 million tonnes of goods per annum which are mainly associated with the local petrochemical, chemical and steel processing industries. The port is an important piece of logistical infrastructure for the NEPIC cluster of process companies. PD Ports, who own Teesport, is headquartered in Middlesbrough adjacent to Middlesbrough railway station. Landmarks Transport Road Main Triple-digit roads Bus Most of the area is served by Stagecoach's Tees Flex network, a pre-bookable service running in and around the valley, mainly serving Stockton on Tees, Darlington and Redcar and Cleveland. Services are operated by a dedicated fleet of Mercedes-Benz Sprinter minibuses. Rail Stations The stations, by borough, are as follows: Darlington: , , and Hartlepool: and Stockton-on-Tees: , , , , and Middlesbrough: , , , and Redcar and Cleveland: and , , , and . Lines is connected to the East Coast Main Line (ECML) and provides fast connections to London and Edinburgh. From May 2018, the UK Government announced that the line was to be re-nationalised for the second time since privatisation in 1997. Tees Valley line, serves most of the area and links to Darlington and Teesside Airport Station, with sections being the former Stockton & Darlington Railway. Durham Coast Line, connects , , and with the main line. Northallerton–Eaglescliffe Line, connects and with Durham Coast Line. Esk Valley line: services most Middlesbrough stations Services York-based LNER serves the full