Following the reasonable appeals to stay on topic, this article may have more pertinence:
No Type 26 frigate deal unless it is 'value for money' - BBC News
It seems to me to be to soon to be making any "brexit adjustments" to budgetary spend at the moment (in regard of defence, or anythng else) but clearly everything is on table and in play in these troubled times.
How far are we down the line with the P8 contract...have we reached a stage where pulling out would cost us penalty payments?