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Lw.
lemonade
I paid £65 to get calculations in two hours from this website:
https://www.beamcalculation.co.uk/start-calculation/
It's quite simple to use but I got my builder to do it to make sure it was right.
He assured me that all a proper structural engineer does is put their measurements into a calculator like this anwyay.
Then for knock thru I paid this - NB London prices may be more!