April is the month the British spring stops being theoretical. Blossom comes out along suburban streets, the first cricket is played on grounds still soft from winter, St George's Day passes on the 23rd without a day off attached, and the weather does the thing it is known for — showers and sunshine within the same hour, several times over.
Where Easter falls inside April 2028, two bank holidays come out of the 30 days of the month and the working-day count drops accordingly — by one rather than two in Scotland, which does not treat Easter Monday as statutory. In years where Easter comes early, April can pass with no bank holiday at all.
April 2028 runs to 30 days and sits at the start of the second calendar quarter of a year of 366 days. The tax year that opened on the 6th has eleven and a half months still to run, and the next fixed deadline against it, the paper filing date, is not until the end of October.