OltonPete
Your link with regards the A321s is a red herring.
That web site as it states, incorrectly stated that the new build A321s had been cancelled.
The 7th and 8th aircraft to be acquired are second hand A321s, this is why it is no use looking at seat plans for flights this summer.
Jethro's correctly reported that these a/c may now be A320s, as that was the case last week.
This is currently very fluid, as the airline would like A321s, but there is a lack of suitable aircraft on the market of the type Monarch wants.
However some A321s are being offered to Monarch, which are not ideal and a decision is awaited by the board, this to go with the A321s or the A320s being offered.
Other problems that have to be taken into account are delivery dates, some may be late May which gives the airline problems.