Sourdough fun or 'quarts into pint-pots'

Like so many others, I have discovered THE best way to bake Sourdough loaves is in a heavy, lidded cast iron pot, sometimes called a Dutch Oven.

My fabulous oval orange Le Creuset, vintage 1978 (a wedding present) is perfect for this:

My even older (Mum's? Grandmother's?) colander makes a perfectly adequate 'proving basket'. 

It is however round, as colanders are wont to be, and sometimes my ready-to-bake proved loaves are SO huge these days that a little squishing is sadly necessary..

'I need a large round cast-iron pot'!

I look online...'How much???!!!'

£230!!!

I need a little lateral-thinking!

Aha! I buy instead an oval proving basket (actually an old Pyrex, minus it's lid)

£2 in a charity shop...whew!