A few general points, give that some people seem grossly ignorant about the state of Britain in 1919.
OTL even after victory Britain came close to revolution in 1919. Troops, armoured cars, artillery, tanks and warships were widely deployed to maintain order. The view that the British military was monolithically loyal to the government is a superficial one that doesn't stand up to scrutiny. There were numerous (illegal) military strikes and outright mutinies in 1918-19. Some examples:
1. In Purbright camp in early 1919 machine-gunners of the Guards went on strike
2. On 13NOV1918 Shoreham camp experienced a full-scale mutiny over conditions and the slow pace of demobilisation. The troops won and were released from service rapidly, by the thousand.
3. On 09DEC1918 Royal Artillery units in Le Havre rioted and burned down army depots.
4. January 1919 saw sustained and violent mutiny and rioting at the camps around Calais, including the election of a Soldiers’ Council at Valdelièvre (where the rebellious troops fortified the camp against attack. The military headquarters at Calais was occupied and a Soldiers’ and Sailors’ Association twenty thousand strong formed. The mutineers enjoyed extensive support of French civilians, including railway workers who refused to transport troops to suppress the nascent Calais Soviet. When Byng finally arrived to suppress the mutiny he found his troops unwilling to fire on their own.
5. A mutiny at Felixstowe saw over ten thousand men voted to form a Soldiers’ Union and refuse to obey orders until their demands were met.
6. At Kimmel Park camp over 15,000 Canadians rioted in early March 1919.
7. The period January-March 1919 saw a huge number of muties and "acts of disobedience to lawful authority" at Aldershot, Biggin Hill, Blackpool, Briston, Chatham, Dover, Fairlop, Folkestone, Grove Park, Kempton Park, Maidstone, Osterley Park, Park Royal, Shoreham, Shortlands, Southampton, Southwick, Westerham Hill and elsewhere.
8. In addition there were outbreaks of disobedience at several railway stations (mainly in London) where troops refused to embark for France and (especially) Russia.
9. The Royal Navy there were refusals to weigh anchor for Russia on numerous occasions in 1918-19 at Invergordon, Portsmouth, Rosyth, Devonport and Fort Edgar.
10. In February civilian workers at Rosyth discovered that the cruiser they were involved in refitting was to go to Russia; with members of the Socialist Labour Party they leafleted the crew, who refused to sail and were paid off after a three-week standoff in the port. This civilian resistance to intervention in Russia, suggests an active Labour/Union force available; for example in May 1920 dockers in the Port of London refused to Jolly George with an arms consignment for Poland.
11. Rosyth saw other mutinies, for example that on the mine-sweeper detachment in January 1919.
12. A few days later the patrol boat 'Kilbride' at Milford Haven mutinied and raised the Red Flag.
13. At Port Edgar a destroyed flotilla due to return to Russia was a hotbed of rebellion; eventually less than half the ships departed, with crews drawn from Atlantic fleet battleships. Some of the destroyers' crews evaded the security at the port and (with assistance from others) 44 men made their way to London to present petitions at Whitehall.
14. A Royal Marine battalion at Murmansk also mutined, with two companies refusing orders.
1919 saw active resistance to the British government in Scotland, parts of Wales, Ireland as well as cities like Liverpool.
1. Warships (including the battleship Valiant) were sent to Liverpool in a show of force, with orders to occupy the docks and be prepared to bombard the city.
2. Thousands of troops, with tanks and armoured cars in support, had been deployed "suppress disorder" in the streets of several cities. Including Liverpool
3. The "Battle of George Square" on 31JAN1919 occurred when Glasgow police attempted to suppress strikers. Churchill ordered soldiers and tanks to the city to prevent any further gatherings and to deter a "Bolshevik uprising. There were explicit parallels with the 'Forty Hours'. Scottish units were confined to barracks/camps under guard due to fear of mutiny and insurrection.
4. Over a thousand soldiers had marched under arms on Downing Street in early 1919, before being disarmed by a battalion of the Grenadier Guards loyal to the government.
5. Rioting in Luton had led to the arson of the town hall and further deployment to troops.
