By some form of elimination my vote goes for ash.
In my opinion,
It's not Apple, wrong colour and apple doesn't splat like that
Sycamore, because it's not,
Holly, nope
Beech, don't think so as it would be more coloured if it was that pinky.
Punky and slightly spalted indicates a slow colouring timber when it spalts, beech and particularly silver birch do it reasonably quickly, holly takes time but generally remains white and greys but can go green.
The bark of young trees or branch wood can be very deceiving but there are one or two tail tell signs that points me towards ash.
But then again I could be wrong.
