With grateful thanks to Steve Cady (of Castles of Tin fame) the mystery of the two unidentified pre dreadnoughts has been solved. They are the two ships of the Swiftsure class second class battleships Swiftsure class battleship.
I must confess that I have always had a soft spot for these ships - probably because I am a sucker for non standard designs - so I am pleased to have them for use in the Fezian navy. I have slightly modified the overall approach that Fezia has taken towards her navy and so they now tend towards speed and lightness of armour and gunfire.
I am intentionally making the two fleets as different as possible in terms of capability so that the resultant actions will be tactically challenging. Having two equal forces of ships lined up against one another is not hugely exciting in my experience so 'mixing it up' means that the two sides have different things to consider from a gaming perspective - especially the firepower, speed and the protection of the opposing combatants.