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A Middle Byzantine coin from Carbis Bay, Cornwall — a new brief post by me :) https://www.caitlingreen.org/2020/12/a-middle-byzantine-coin-from-carbis-bay.html
It is not the only find of a Byzantine coin from a south-western beach — for example, a 6th- or 7th-century Byzantine coin was found several inches down in a rock pool on Perranporth beach, Cornwall: https://finds.org.uk/database/artefacts/record/id/469910
A Byzantine follis probably of Tiberius Constantine (578–82), which was found on the beach below an early medieval fortified settlement: https://finds.org.uk/database/artefacts/record/id/800604
Furthermore, the Carbis Bay coin comes from an area (St Ives Bay) with evidence for Late Roman and Early Byzantine finds originating in the eastern Mediterranean: https://www.caitlingreen.org/2018/01/st-ia-of-st-ives-byzantine-saint.html & https://www.caitlingreen.org/2018/05/phillack-and-the-hayle-estuary.html
For the early medieval finds from Phillack and the Hayle Estuary, see further here: https://twitter.com/caitlinrgreen/status/1002276733746405377
A 9th- to 11th-century Hiberno-Norse buckle found at Phillack, Cornwall: https://finds.org.uk/database/artefacts/record/id/190941 & https://finds.org.uk/database/artefacts/record/id/617264 And a late 10th-century cut silver halfpenny of Æthelræd II (978–1016), found near Phillack church.
Other finds of Byzantine imports come from the NE of St Ives Bay, on the important early medieval site of Gwithian (see https://www.researchgate.net/publication/310596540_Gwithian_Scientific_dating_AMS_programme); the site were positioned along the top of a linear sand dune (pictured), probably then located on the edge of a tidal inlet.
Spindle-whorls found at Gwithian, Cornwall, made out of fragments of Late Roman 2 amphorae—British post-Roman Bi—produced in the Aegean (C. Thomas).
For more on the important post-Roman specialised industrial complex at Gwithian, Cornwall, that has produced early Byzantine finds, see here: http://archaeologydataservice.ac.uk/archives/view/gwithian_eh_2007/index.cfm
One further site in the Carbis/St Ives area where Mediterranean imports (sherds of African Red Slip Ware & an amphora) are said to be found is Hellesvean, St Ives (pic=5thC ARSW bowl on display in the Royal Cornwall Museum & non-imported pottery from Hellesvean & Gwithian)
Some saints possibly came for the ride too, such as St Ia of St Ives, Cornwall — late medieval legends claim she was Irish, but I would argue that there's a good case to be made for her being the Byzantine St Ia who was popular in 6thC Constantinople: https://www.caitlingreen.org/2018/01/st-ia-of-st-ives-byzantine-saint.html :)
Finally, with respect to the national context, the Carbis Bay coin is one a number of Middle Byzantine coins now known from Britain, as mapped here. Another comes from a 10th-/11th-century site near the Late Saxon burh at Axbridge, Somerset, & another was excavated at Winchester.
Another Byzantine coin from Winchester, this time a follis of Basil I found by the Roman road running north-east from Winchester and dating to 868–70: https://books.google.co.uk/books?id=hqskIWgAaxwC&lpg=PA671&pg=PA671#v=onepage&q&f=false
Needless to say, the Carbis Bay coin and similar items may offer some further context for the interesting later tenth-century Persian description of Britain as an emporium of the Byzantine Empire in the Ḥudūd al-ʿĀlam: https://www.caitlingreen.org/2016/04/heptarchy-harun-ibn-yahya.html
Some evidence for Greeks living in and visiting 10th- and 11th-century England: https://books.google.co.uk/books?id=V2o0EkM-tYYC&lpg=PA130&pg=PA130#v=onepage&q&f=false
