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I doubt they would have ideas or sketches for initial contact, every site is unique so bringing generic ideas would not really be helpful to anyone, their portfolio/previous work should be the references you need.
It sounds like using a good architect is what you want/need as builders stick with what they know, outside of London I imagine its even worse.
IMO the things that make almost the biggest difference is the glass, so work out how much you wanted to spend and type and choose accordingly (Max light for sliding doors and pivot doors, Velfac for French doors). A flat roof will allow for simpler roof lights which are all about 1K a pop and look the same.
If you have a strong idea what you want you could draw up rough plans, get hive mind input, and then get the technical stuff done by Resi (online "architects").
My references that I shared with our Architect: https://www.pinterest.co.uk/chrispgordon/final-references/
Would an architect not have a portfolio of sketches/ideas for this initial contact?
'Something like this Mr Hammer, obviously tailored to the land?'
'Yep great, where do I sign?'
The problem I am having at this very early stage is that the building firms around here (not london) all appear to want to build a brick box with small windows...