Forgive me if I have missed it but you haven't said what the "cheaper" alternative would be have you? Perhaps you have and I missed it.
It's on the previous page. Slap an extension (orangery-style) on the end that doesn't touch the boundary and doesn't disturb any load-bearing walls, enlarging footprint of existing timber conservatory that needs replacing anyway.
Sorry, I didn't make myself clear - how much would that cost to do?
@NickCJ started
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Forgive me if I have missed it but you haven't said what the "cheaper" alternative would be have you? Perhaps you have and I missed it.