The creation of the district

Until the end of the 1960's, La Mina was little more than an area of cultivated fields, livestock and La Mina, view from the motorwayscattered hamlets just outside the Barcelona city limits. At the time Barcelona was experiencing very high immigration from less developed areas of Spain, particularly Andalusia. The immigrants arrived in the city with minimal resources leading to the growth of some of the largest shanty town constructions in the country. Shacks sprung up in many peripheral parts of the city, including Montjuïc, Campo de La Bota, Perona, Casa Antúez, l'Hospitalet and Hospital de St. Pau.

Barcelona had been looking for a solution to this serious shanty town problem since the end of the1950's. A planned New Town in the district was approved in 1959 but not realised. It was not until 1968 that land was purchased by the Barcelona Council for the construction of low-rent housing in La Mina.

Construction began in 1969 but was quickly brought to a halt after the completion of only approximately 500 apartments when the city council realised that the size of the blocks would not permit the relocation of all the shanty town residents. This first development in the district is subsequently known as 'Mina Vieja' (Old Mina).

https://geographyfieldwork.com/La Mina.htm

An overspill estate is a housing estate planned and built for the housing of excess population in urban areas, both from the natural increase of population and often in order to rehouse people from decaying inner city areas, usually as part of the process of slum clearance. They were created on the outskirts of most large British towns and during most of the 20th century, with new towns being an alternative approach outside London after World War II. The Town Development Act, 1952 encouraged the expansion of neighbouring urban areas rather than the creation of satellite communities.[1][2] Slum clearance tenants often had problems with the move, since it separated them from extended family and friends, needed services were often lacking, and only the better off workers could afford the extra cost of commuting back to their jobs.[3][4][5] Another criticism was that the new estates occupied what had been productive agricultural land.

https://en.wikipedia.org/wiki/Overspill_estate

An overspill estate is a housing estate built to ease overcrowding on an existing housing estate. It may not be adjacent to the existing estate but located elsewhere in the city or town. In postwar Britain, they were built usually on greenfield land on the periphery of towns and cities to accommodate those displaced by the slum clearance programs in the inner-cities.

https://ukhousing.fandom.com/wiki/Overspill_estate

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Note added at 24 mins (2019-08-21 09:45:08 GMT)
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Los Poblados de Absorción pretendian cumplir el doble objetivo de cobijar de forma rápida y barata a la población inmigrante que se asentaba en chabolas en el extrarradio de Madrid y organizarlos de manera ordenada en poblados satélites autónomos alrrededor de la capital. Arquitectónicamente, se trataba de bloques de viviendas unifamiliares en horizontal, de una o dos plantas, y de bloques colectivos de cuatro o cinco alturas. Los Poblados de Absorción fueron el principio de los posteriores “poblados dirigidos”, de los que en Fuencarral también existe un ejemplo.

https://urbancidades.wordpress.com/2007/05/02/poblados-de-ab...

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Note added at 27 mins (2019-08-21 09:48:29 GMT)
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An overspill estate is a housing estate planned and built for the housing of excess population in urban areas, both from the natural increase of population and often in order to rehouse people from decaying inner city areas, usually as part of the process of slum clearance. They were created on the outskirts of most large British towns and during most of the 20th century, with new towns being an alternative approach outside London after World War II. The Town Development Act, 1952 encouraged the expansion of neighbouring urban areas rather than the creation of satellite communities. Slum clearance tenants often had problems with the move, since it separated them from extended family and friends, needed services were often lacking, and only the better off workers could afford the extra cost of commuting back to their jobs. Another criticism was that the new estates occupied what had been productive agricultural land.

https://www.revolvy.com/page/Overspill-estate

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Note added at 1 day 4 hrs (2019-08-22 13:30:19 GMT) Post-grading
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As far as I know, I don't think there have ever been any shanty towns in the UK. Anyway, glad to have been of help and thanks for the points :-)