I know they're all the rage right now but will you have an air fryer? If so then that is effectively a second oven.
The only time when I would like anything other than a single oven is when I'm doing a big roast and roast potatoes are in at a high temperature and I also want some meat or veg or something in at a lower temperature, but the last few times I've had an air fryer for that lower temperature cooking.
Even in this example you can pretty easily get away with one oven, given resting etc. I mean it's obvs nice but many other appliances I'd prio over a 2nd oven
I suspect the number of people reverse searing some meat regularly is pretty low. Obviously it is nice to have two ovens but I think the large majority with an average sized London kitchen would find the space more useful for something else.
I know they're all the rage right now but will you have an air fryer? If so then that is effectively a second oven.
The only time when I would like anything other than a single oven is when I'm doing a big roast and roast potatoes are in at a high temperature and I also want some meat or veg or something in at a lower temperature, but the last few times I've had an air fryer for that lower temperature cooking.