The interval (constant at any one place) may vary from 6 mins.
Add a chopped red pepper, some chopped mushrooms and, after a few mins, a chopped courgette.
We guess it took about 45 mins to dilate from 2cm to full dilation.
Pile the meringue on top of the custard and return to the oven for a further 15 mins or until the meringue on top of the custard and return to the oven for a further 15 mins or until the meringue is set.
We are only 15 mins from Alton Towers theme park!