Hi Chris.
I have White Light P31/6.
A few weeks ago I had a chain plate /bulkhead failure on the port side. Which I would advise all P31 owners to check extensively as there were no external signs of this because the bulkhead is fibre glassed in, so not visible.
This caused the bulkhead to tear in half and split the deck. (Not good 😌).
On taking the mast down, it was found cracked at the forestay fitting.
I have been quoted for a new mast by Z spars and the section is Z401.
Thanks for your post.
I have checked and this new section is 29mm wider and 45mm deeper, and I have now contacted the repairers to have it checked and I will let you know the outcome.
Regards Paul