Thanks OnePlan. In answer to your question, this is somewhere we're planning on staying 'for life' so with a toddler and another one planned in the very near future we just thought it would be more practical to end-up with a large master with ensuite, good sized second bedroom and two smaller doubles - one each for the children and a guest room. I know it all boils down to individual circumstances, hence the above but it's otherwise a large property (nearly 2000 sq ft) in a lovely plot and area so the only real compromise seems the missing fourth bedroom.

I found the Dulux Visualator, or whatever it’s called, to be pretty useless. I used it once to visualise my old sitting room colour just to see how accurate it was. My walls were Dulux Elderflower so compared it on the Dulux online thingy and it was completely different!

I'd start by finding out if the foundations for the ground floor extension will support another storey, or you could build our further.

I also don’t think you can live there while it’s being done. I think you should look into raising the roof then connecting the main house roof to the roof of the kitchen wing. I also don’t think you need to remove what looks like a top end conservatory. But you do need to find a good architect to help discuss what is possible and you need to think about your budget as it’s a big undertaking. For what it’s worth this is what I would do.