GTR operates the Southern rail franchise in England, which covers several counties south of London. They are currently in a dispute with the RMT and ASLEF Unions over on-board roles and responsibilities.
I work with a number of town centres across the affected region and we are interested in seeing the effect of these actions on High Street performance. To achieve this, I have compiled a list of dates and sources. It will be updated as I gather more information, and I welcome contributions.
Disclaimer: This post was last updated on 6 December 2016 and is a work in progress. E&OE. It may not be current and should not be relied upon for planning or other purposes.

Apr 2016

1100 Tue 26 April - 1059 Wed 27 April
RMT strike, 24 hours - Sources: BBC; RMT Website

May 2016

**Postponed **1100 Tue 10 May - 1059 Wed 11 May
RMT strike - Source: RMT Website; postponement notice
**Postponed **1100 Thu 12 May - 1059 Fri 13 May
RMT strike - Source: RMT Website; postponement notice
0001-2359 Wed 18 May
RMT strike. Was Fri 20 May but brought forward. Sources: Southern Press Office 1 & 2; RMT switch notice
**Brought forward **0001-2359 Fri 20 May
RMT strike. Pulled back from two previous 24-hour strikes. Source: RMT Postponement notice

June 2016

0001-2359 Tue 21 June
RMT strike. Sources: Southern press release; BBC; Twitter

July 2016

* Southern began revised timetable from 11 July 2016

Aug 2016

0001 Mon 8 Aug - 2359 Friday 12 Aug [Sources: RMT announcement and calling-off]
RMT Strike suspended at 2200 on Wednesday 10 August. Southern resumed pre-strike timetable on Friday.

Sep 2016

0001 Wed 7 September - 2359 Thu 8 September
RMT Guard strike on Southern [Source: RMT]
**Called off **0001-2359 Wed 7 September
RMT Station staff strike across GTR i.e. not specific to Southern [Source: Southern; RMT calling-off]

Oct 2016

0001 Tue 18 October - 2359 Thu 20 October
RMT strike [Source: BBC; RMT]

Nov 2016

0001 Thu 3 November - 2359 Sat 5 November [Source: BBC]
RMT strike
0001 Tue 22 November - 2359 Wed 23 November [Source: BBC]
RMT Guards strike

Dec 2016

0001 Tue 6 December - 2359 Thu 8 December [Source: BBC; RMT]
RMT Guards Strike
Tue 13 December - Wed 14 December [Source: ASLEF]
ASLEF Drivers strike
Fri 16 December [Source: ASLEF]
ASLEF Drivers strike
0001 Mon 19 - 2359 Tue 20 December [Source: RMT]
RMT Guards Strike [changed date, was 22-24 Dec]
**Brought forward **Thu 22 - Sat 24 December [Source: RMT]
RMT Guards Strike - brought forward to 19-20 Dec
0001 Sat 31 December - 2359 Mon 2 January 2017 [Source: RMT]
RMT Guards Strike

Jan 2017

Mon 9 - Sat 14 ASLEF [confirmed ASLEF website]

Updates?

Please use the comment form below. Note: This post is not intended for debate on the actions. Comments welcome for date changes, corrections and updates only. All others will be removed.