Industrial action disruption - possible during engineering passenger diversions?

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From BBC^» (British Broadcasting Corporation - home page) News

Northern and South Western rail strikes disrupt events

Workers on Northern Rail and South Western Railway (SWR^» (South Western Railway - about)) have begun a new strike in the long-running dispute over the future of train guards.

Members of the Rail, Maritime and Transport Union (RMT^▸ (National Union of Rail, Maritime & Transport Workers)) stopped work for 24 hours at midnight.

Northern said the action would hit Manchester's Christmas markets while SWR said it was causing "misery".

The quote is for Northern, but I have a question for South Western where, I understand, the unions have a (further) six month mandate for industrial action which has to be announced with a minimum two weeks notice. Not my area of expertise - can member(s) of the forum please let me know to correct any areas I have it inaccurate or plain wrong.

My question ... is there any chance of South Western Railway services being seriously effected over the Christmas period while engineering is taking place at Paddington and enhanced passenger flows into Waterloo from Reading and Exeter are likely?

As a follow up ... looking a long way ahead (can it go on that long) ... how about dating the 3 weeks and 4 weekends of Whiteball Tunnel closure in the 2nd half of Feb 2019 and the beginning of Match?

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My question ... is there any chance of South Western Railway services being seriously effected over the Christmas period while engineering is taking place at Paddington and enhanced passenger flows into Waterloo from Reading and Exeter are likely?

Looks like they have gone for the Saturday before instead. From ITV

Workers on South Western Railway are to strike on the Saturday before Christmas in the long-running dispute over guards on trains.

The company, which has been hit by a series of delays in recent weeks because of signal and train failures, runs services into London Waterloo, the busiest station in the UK^▸ (United Kingdom).

RMT^▸ (National Union of Rail, Maritime & Transport Workers) general secretary Mick Cash said:

"South Western Railway continues to refuse to resolving this dispute, which is about safety, security and access while the company look to open up a loophole that would allow them to run driver-only services at their discretion.

"Recent figures have shown a shocking a surge in violence on our railways. It is frankly appalling that South Western Railway are looking for a green light to throw the guard off their trains as and when they see fit in the name of profit.