Just for fun scenario

[Tarrel]

It's rarely as black and white as "100,000 vs 60 million". Many people can become compliant with a totalitarian regime, especially if the rules are presented for their "security" or as an act of patriotism. The human psyche has a strange tendency to become compliant under a rule of fear. We see it time and again; the concentration camps of Nazi Germany, Srebrenice, the Islamic State beheadings, the Soviet gulags. People politely waiting to be killed rather than turning on their executioners and fighting to the death at the last minute.

There is also the "grey area" of those aiding and abetting the regime, whether through indoctrination, incentive, fear or a combination of all these. These people can swell the numbers of those on the authorities' side and give them a reach that they might not otherwise have. Child soldiers in Africa are often recruited and kept on-side through a combination of indoctrination, drugs and provision of trinkets such as mobile phones. Such soldiers are used against their own people in civil or inter-ethnic warfare.

So, I have no doubt about the authorities' ability to impose martial law in the UK.

What would I do? Try to bug out to my woodland. I have a deep-seated rebellious nature which would make it difficult to become a fully paid-up, chanting, flag-waving member of the oppressing side (the other alternative) without losing my sanity.

Or try to leave the country.