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I would be tempted to bite the bullet and put a higher current circuit in, if that's an option.
If not, I spent many years cooking in a single gas oven and by and large it was fine. At Christmas, I had to rely on the goodwill of my neighbours for additional oven space.
These days, I wouldn't want to go back to a single oven. A free standing micro / combi would be a good addition to a single gas oven. Had a Panasonic combi for a long time. It was good.
one of my biggest annoyances when cooking is needing to put two things in the oven at different temperatures and having to just wing everything to try and undercook one for longer and overcook the other shorter.
I've also finally got the hang of the old frying pan pizza technique recently and I think having a smaller oven cavity for the grill will help with temps as well as quicker preheating time. I'm not really a roast dinner kind of person so dont really need one massive oven.
a combi microwave would give similar utility but they only go up to 220c assuming all the sockets are on the same ring I may also run into load issues running effectively two ovens at the same time anyways.
if gas is a load of shite for oven cooking i'll probably stick with a single oven but surprisingly options for dual fuel freestanding cookers with just one oven are quite limited.