The letter is a disgrace.
It starts by saying that we will get a rise equivalent to an RPI of 2.7% pa.
It explains the 1.5% for 6 months followed by the 1.2% for 6 months.
It does not say that this equates to 2.1% pa.
In fact it says that in 12 months time we will be earning 2.7% more, which is the same as RPI.
Do they assume that none of us can do O-Level maths? We can fly a 737/319 but not do percentages.