There's loads of daylight in March for 3pm KOs. Even on the very first day of the month in Berwick-on-Tweed, sunset is at 5.42pm, a full hour after a game would finish, with light being playable for a wee while after sunset too... so not sure why it would ever have been felt necessary to hang on until the final w/e of the month
Might be of use, see below London & SE regs for this season, and the RFU regs they are based on:
LSE Admin Instructions 2024/25 – Section 7
Kick-off Time for Matches, Supplementary to RFU Regulations 6.41 – 44 inclusive.
In accordance with RFU Regulation 6.41 all matches shall kick-off between 2.00pm and 3.00pm.
In the event of adverse weather conditions matches may kick-off between 1.00pm and 4.00pm on Artificial Pitches.
Clubs without floodlights must kick-off NO LATER THAN:
3.00pm - September, October;
2.00pm - November, December & January
**2.30pm - February
3.00pm - March, April;
**Amended 1st January 2025
Where the two clubs mutually agree on a kick-off time outside these times, they shall do so in conjunction with the League Secretary – as the representative of the “Committee” and in accordance with RFU Regulation 6.42.
Although the ROC has always ruled that clubs involved in offshore matches are expected to be sympathetic to the flight requirements of the visitors, that ruling does not alter the status and requirements of RFU Regulations 6.41 to 6.44 in any way.
RFU Regulations Section 6
Kick Off
41. All matches shall kick off between 2-3pm (as determined by the home Club) except for those matches played in November, December, January, and February, which shall kick off at 2pm, unless otherwise approved by the Organising Committee. In the event of adverse Weather conditions, matches may kick-off between 1-4pm to allow for multiple matches to be played on Artificial Pitches, at all times at the discretion of the Organising Committee.
42. Kick-off time may be varied by mutual agreement between the two teams and the home team must advise the Match Officials of any changes.