Question: When was the town, located approximately 45 miles north-west of London where Gerald Eve LLP has offices, formally designated as a new town?

Context paragraphs:
Willow Beach National Fish Hatchery: The Willow Beach National Fish Hatchery is administered by the U.S. Fish and Wildlife Service, located approximately 45 miles (72.4 km) South East of Las Vegas, Nevada, in Mohave County, Arizona on the Arizona side of the Colorado River twelve miles (~19 km) south of the Hoover Dam.

WFRE: WFRE (99.9 FM) is a radio station located in Frederick, Maryland, in the United States.  It plays Country music and is owned by iHeartMedia along with its sister station 930 WFMD.  Despite the station being located approximately 45 miles (72 kilometers) away from the two closest major cities (Baltimore, Maryland and Washington, D.C.), its strong signal (7,600 watts) reaches both major markets.

Milton Keynes: Milton Keynes ( ), locally abbreviated to MK, is a large town in the Borough of Milton Keynes, Buckinghamshire, of which it is the administrative centre.  It was formally designated as a new town on 23 January 1967, with the design brief to become a "city" in scale.  It is located about 45 mi north-west of London.

Gerald Eve: Gerald Eve LLP is a real estate advisory business headquartered in London, United Kingdom.  The firm has offices in West End of London, The City of London, Glasgow, Birmingham, Leeds, Manchester, Milton Keynes, Cardiff and West Malling.

Aikshaw: Aikshaw is a hamlet in the civil parish of Holme St. Cuthbert in Cumbria, United Kingdom.  It is located approximately one-and-a-half miles north-west of the village of Westnewton, and three miles east of the village of Mawbray.  Jericho is located approximately one mile to the east, with Edderside approximately a mile further to the south-east.  Mealrigg is located half-a-mile to the south.  Carlisle, Cumbria's county town, is located approximately twenty-two-and-a-half miles to the north-west.  Aikshaw lies on the B5301 road, which runs from Silloth-on-Solway in the east via Tarns, Westnewton, and Aspatria to the A595 between Cockermouth and Bothel.

Chewelah, Washington: Chewelah ( ) is a city in Stevens County, Washington, United States.  It is located approximately 45 miles north northwest of Spokane, WA.  Chewelah was labeled Chiel-Charle-Mous on the 1897 U. S. Land Office Map.  The population was 2,607 at the 2010 census which was a 19.3% increase over the 2000 census.

Port Loko: Port Loko is the capital and second largest town of Port Loko District in the Northern Province of Sierra Leone.  The town had a population of 21,961 in the 2004 census and current estimate of 23,915.  Port Loko lies approximately 45 miles east of Freetown.  The area in and around Port Loko is a major bauxite mining and trade centre.  The town lies on the main highway linking Freetown to Guinea's capital Conakry.  It also lies on the over-land highway between Freetown and its major airport, Lungi International Airport, although most travellers complete this journey via the much shorter ferry or helicopter transit.

Geldern-Kapellen: Geldern-Kapellen is a town of about 2500 people in northwest Germany near the border of the Netherlands.  Since 1969 the village has been a part of the city of Geldern.  The area Kapellen lies in the Niederrhein (Lower Rhine) in the northwest part of German Federal State of Nordrhein-Westfalen.  The village is approximately 45 miles (72 km) from Düsseldorf, 10 miles (16 km) from the Rhine River at Xanten and 111 miles (180 km) from Amsterdam, Netherlands.

Otley, Iowa: Otley is a small unincorporated community in Marion County, Iowa, United States.  Governed by state laws and county ordinances.  It is located approximately 45 miles southeast of the capital, Des Moines, on Iowa Highway 163.  The US Post Office has a ZIP Code of 50214.  Otley has one post office and is home to Vyke Industries, Mills Mid-Iowa Machinery, LLC, Otley Reformed Church, and Two Rivers Co-op.

Skull Valley Indian Reservation: The Skull Valley Indian Reservation is located approximately 45 miles southwest of Salt Lake City, Utah.  It is inhabited by the Skull Valley Band of Goshute Indians of Utah, a federally recognized tribe.  The population includes approximately 31 people in 7 households and is characterized by a high incidence of poverty.

Supporting paragraphs: Gerald Eve Milton Keynes
Answer: 23 January 1967