Those front doors on Pintrest are beautiful! I wish mine looked like that.
I have an Edwardian house, the original door is long gone, I suspect it wasn't as fancy as the Pinterest ones. The porch door has a massive gap at the bottom and a badly fitted Macclesfield sill - it's a device to stop the gap at the bottom of the door. It is fitted too low down, it would work if it wasn't. It's very cold in the winter.
Example of Macclesfield sill:
store.northwesthardware.co.uk/inward-opening-sill.html
Someone on here recommended ebay for cheaper Victorian/Edwardian tiles, they have some great ones. You would have to check they were appropriate for outside use.
This company have reproduction doors. It's just the price for the door, the glass would be more, I'm guessing that complex glasswork isn't cheap. You would need to cost in getting a fitter too and any work on the door frame etc.
Example:
insitumanchester.com/shop/doors-and-entryways/traditional-style-exterior/exterior-05/
They deliver nationwide, not sure about delivery charges, their max charge is £150 and they have bigger items than doors.
Do you have a photo of your door at the moment? Is it worth keeping the original?