When we replaced our boiler all the quotes we got said stay away from a combi as it wouldn’t be effective for us due to the layout of the house and 4 of us / chance of multi showers on a morning etc.
We went for a non-vented pressurised system which works really well.
Next door have the same house design and have a combi which they are replacing for similar reasons.
New solar will have an “Eddi” diverter which will heat the water during the day rather than back to the grid once the battery is full.
I’m considering that for when I also get solar.