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I only saw the first colour pic and thought 'why don't they go all the way across the back?' then I saw the second pic and thought 'fugly'.
I had a similar extension all the way across the back on a similar red brick house but we had a pitched roof which IMO looks nicer.
So my preference would be all the way across but try to make it look more attractive.
Will try to dig out some pics
We got some designs back from the architect - we’d decided against the extension but they’re trying to lure us back in and a bigger kitchen does sound nice.