On 16/04/2019 22:21, newshound wrote:
This can be fairly extreme DIY, but if you like a challenge it may be
cheaper and more satisfying than "getting a man in".

It will be a big help if you have a similar (openable) door to look at
to try to understand how it works.

Yes I have a similar door but will probably wait until the weather is a
bit better. I have a back & front door but for some reason the previous
owners built a porch at the side with another door on it....never use it
and I doubt if they did either.