Is there a contemplation period before signing mortgage?

I have been in to the bank and signed up for a mortgage. I was talking to a friend and he said that the bank legally should have given me a period to think about the mortgage. Basically I was presented with a mortgage and signed it there and then.
Is this true? Should they have presented me with the mortgage and then not let me sign it for x amount of days?

This is in the United Kingdom.

I am curious more than anything but this is my first mortgage so I do not want any issues arising.

Thank you all

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