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.
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
hfell
Richmond
Hamstead, London.
Derby, Tenby, Whitby.
Mayfair - in central London.
In Britain, several towns have names ending with "magna," which is derived from Latin meaning "great." Notable examples include Luton Magna and Tewkesbury Magna, both reflecting historical significance. The use of "magna" often indicates a larger or more important settlement compared to nearby places. These names can often be found in areas with rich historical roots, particularly in England.
There are many of them. Here are just ten.OxfordHerefordChingfordChelmsfordBedfordGuildfordThetfordStaffordTelfordBradford
Aysgarth - west of Northallerton, North Yorkshire
Compton Magna amongst others.
WALTHAMSTOW