Saw this and reminded of the pop gun discussion - not surprising the Romans found Britland a walkover...
And on an invasion trail of thought, I think I stumbled across the perfect patron Saint for brexiters while reading
Night Raid about the Bruneval radar raid. St George doesn't count as he was a Johnny Foreigner.
I hereby nominate Robert Watson-Watt 1935 who declared 'Britain has become an island once more' following a successful trial of RDF / radar and thereafter only took about 5 years to get operational.
Which leads onto the techy problem with Huawei network infrastructure. Can the UK plug the gap with developing and manufacturing replacement hardware and systems inspired by plucky go it alone brexit back-to-the-wallers - might even flog it for it profit to the US ;-) - same goes for a replacement for Galileo that we well could be excluded from.