Can the priest celebrating Solemn Mass (11.00 on Sundays) use the Roman Canon (Eucharistic Prayer 1) more often?

The celebrant chooses which Eucharistic Prayer (EP) to use at Mass.  There is no particular requirement to use EP 1 at a solemn Mass.  Fr Alan has since used EP1 on a number of occasions at 11.00 Mass.  Occasionally Fr Cavan usaes EP 1 at weekday (07.30) Masses.