jojo* are they all from the same extension company*?*? They don't look too bad, but they are part of big extensions, so more variables being changed. I think you are better off going more modern rather than trying to look older, less ersatz... So, probably big, single pane grey aluminium windows, solid timber doors with vertical planks, large sans serif house numbers.
Scrubby, the pics are off the internet and not sure which companies did the makeover. On the ersatz front, I’m from the school of thought of ‘whatever floats your boat’. None of this is the pinnacle of modern design anyway.
I think you would want an architect as they understand things like proportions of windows that might be quite subtle, but would make a big difference, you could target your budget more effectively then.
Also what is the house's wider situation? If it's in a street of similar ones it might look contrived but if it's in its own plot you could look at styles of older houses in the area.
There is a book "village buildings of Britain" by Matthew Rice, it's very interesting on blending new and old homes, different regional styles and how you can get it wrong!