That’s not the total paid, spent another grand for parts I boughtI don't understand how, from the itemised bill - that it's missing an oil pump, water pump and more that you'd expect to be on there, nor does it add up that it's £1620 more than a rebuilt lump from Engine Dynamics.
If it's chugging 1L of oil post rebuild in just 1200 miles, I'd be going back and insisting they fund a proper rebuild elsewhere.
No freshly built engine should be using that much oil. Ever.
For what you paid, I'd be kicking off.