Hutton Magna, County Durham.
Appleby Magna, Leicestershire.
Canford Magna, Dorset.
Chew Magna, Somerset.
Sheepy Magna, Leicestershire (I kid you not).
Fontmell Magna, Dorset.
There are probably more.
Appleby Magna
Chew Magna
Fontmell Magna and many more.
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fanmagna
Chew Magna
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Leptis Magna...in Libya...Roman settlement cityAnother answer:London, Abingdon. The answer above must have got attached to the wrong question, since Libya is not in the UK.
Newark
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Hamstead, London.
Richmond
WALTHAMSTOW
Derby, Tenby, Whitby.
Mayfair - in central London.
There are many of them. Here are just ten.OxfordHerefordChingfordChelmsfordBedfordGuildfordThetfordStaffordTelfordBradford
Aysgarth - west of Northallerton, North Yorkshire
Compton Magna amongst others.
Magna Carta in 1215