International Women s Day and to recognise the 50th anniversary of equal pay legislation in the UK.
During last year s visit, Meghan met Geraldine Dear, who had worked a machinist in the nearby Ford factory where the fight for equal pay began.
Loading the player.
WATCH: Prince Harry and Meghan Markle reveal baby s gender
Workers at the factory went on strike in 1968, after learning they would be paid 15% less than male workers in similarly skilled jobs at the factory.
The strike eventually led to a change in legislation, with the Equal Pay Act 1970.
In the letter, Meghan wrote: It was this time a year ago that I had the pleasure of meeting so many of you during my visit to celebrate International Women s Day and mark the 50th anniversary of the Equal Pay Act.