Question: The Hertford East branch line, and Lea Valley lines, are both in which country? 

Context paragraphs:
Buntingford railway station: Buntingford railway station is a former station in Buntingford, Hertfordshire that served as the terminus of a branch from the Hertford East Branch Line.  It was first opened in 1863 and closed to passengers just over a century later in 1964.  It was served by direct trains from London Liverpool Street.

Chingford branch line: The Chingford branch line is a railway line between Clapton Junction (just west of Clapton station) and Chingford station.  Services currently operate between Liverpool Street station and Chingford.  The branch is currently part of the Lea Valley Lines network.

Ware railway station: Ware railway station is in Ware in Hertfordshire, England.  It is on the Hertford East Branch Line, and train services are provided by Abellio Greater Anglia, which also manages the station.  Ware station is unusual in that it has only a single bidirectional platform and track on what is otherwise a double track railway.  The station building dates back to the opening of the line in 1843.

Lea Valley lines: The Lea Valley lines are two commuter lines and two branches in North East London, so named because they run along the Lower Lea Valley of the River Lea.  They were part of the Great Eastern Railway, now part of the "Anglia Route" of Network Rail.

St Margarets (Hertfordshire) railway station: St Margarets railway station serves the villages of Stanstead St Margarets and Stanstead Abbotts in Hertfordshire, England.  It is on the Hertford East branch of the West Anglia Main Line, and train services are provided by Abellio Greater Anglia, which also manages the station.  St Margarets was previously the junction station for the now-disused Buntingford Branch Line to Buntingford.

Wareside: Wareside is a small village and civil parish in the East Hertfordshire District, in the county of Hertfordshire.  The population of the civil parish as of the 2011 census is 735.  It is approximately 3 miles away from the town of Ware (from where it probably took its name) and the larger town of Hertford, the county town of Hertfordshire.  Nearby villages include Widford, Hunsdon, Babbs Green and Bakers End.  Nearby hamlets include Cold Christmas and Helham Green.  The B1004 linking Ware to Bishop's Stortford goes through the village and the main A10 road can be picked up at Thundridge.  Fanhams Hall Road also links Wareside back to Ware.  Ware railway station on the Hertford East Branch Line is located two and a half miles away.

Buntingford branch line: The Buntingford branch line or The Bunt was a railway in Hertfordshire in the United Kingdom.  It ran between the village of St Margarets and the town of Buntingford.  It branched off what is now known as the Hertford East branch line.

Hertford East branch line: The Hertford East branch line is a railway line in Hertfordshire in the United Kingdom, running between Hertford and Broxbourne .  The line follows the route of the Lea Valley, serving intermediate towns and villages.  It branches off the West Anglia Main Line north of Broxbourne , and could be seen as part of the Lea Valley lines—a collection of commuter routes into London.

Hertford East railway station: Hertford East railway station is one of two stations in Hertford in Hertfordshire, England, the other being Hertford North station.  The station is 24+1/4 mi north of London Liverpool Street and is the terminus of the Hertford East Branch of the West Anglia Main Line with train services provided by Abellio Greater Anglia.  There are two platforms, although platform one is only used during peak times and primarily for trains to and from Stratford.

Brimsdown Industrial Estate: Brimsdown Industrial Estate is located to the east of the residential part of Brimsdown in the London Borough of Enfield.  The estate, which lies in the Lea Valley, is bordered to the west by the West Anglia Main Line portion of the Lea Valley Lines and to the east by the River Lea and King George V Reservoir.  A number of businesses are located here including Warburtons Enfield bakery, warehousing and retail, and heavier industry such as Johnson Matthey, UOP and the Enfield Power Station.

Supporting paragraphs: Hertford East branch line Lea Valley lines
Answer: United Kingdom