Calling all armchair generals! Boudica's Last Stand.

[Nathan Ross]

Manchester (...Worcester...)...  go to Iona

Do you mean Wroxeter, and Mona? Iona is in the Hebrides...

campaign season starts in Late March... is there is time to sow the spring crop

In Britain the campaign season started in the summer (Tacitus, Agricola 20) - in Gaul it only began in July (Ammianus 17.8).

As Paulinus had completed his operations on Anglesey by the time he heard of the revolt, it must have begun in late summer. The planting season missed by the Iceni, therefore, would be the main autumn one, in October. They would have completed their harvest, in August, before beginning the revolt.

16 hours from sunrise to sunset in June seems high

In the UK on the summer solstice (June 21st) there are 16 hours, 41 minutes and 5 seconds of daylight; sunrise is at 04.42, sunset at 21.23.

However, the battle almost certainly happened in the autumn.