@adtankard1
Given that redecoration isn't a problem them you have options to consider before the engineer arrives.
Both WiFi coverage and future arrival of Full Fibre (assuming it comes) should be in your mind.
As already suggested, the box needs to come off and the corner floor board lifted before the install. If the incoming cable goes all the way upstairs then it should simply be a case of replacing the MS. The first question is where?
If there's power available downstairs then it could go there. If Full Fibre arrvies from OR it'll probably come in the same way. With the router attached you have WiFi coverage downstairs. Running an ethernet cable upstairs then gives you a good starting point there.
I mentioned earlier about changing the upstairs socket to an ethernet one. With decoration to be done, if may be possible to fit a flush mounted one as "hacking" holes in the plasterboard can easily be fixed later. Putting a socket downstairs might also be useful. With the ethernet cable in place you can use either a WiFi Access Ppoint (WAP) or any other piece of equipment you may wish to connect.
If you put the MS upstairs, then you can work in reverse. Put an ethernet cable in place and you can add a WAP downstairs.
Note that the upstairs socket could be moved closer to the corner if so desired. the outgoing wire and the socket in the other room can be removed.
Replace the box with modern ducting - the clip on type so you always have access. Ensure it's large enough for two cables (with FF you could have the ONT and router upstairs which is one cable and then bring a second cable downstairs).
You must know what you want before the engineer arrives so you're in a position to talk it through with them and hope they're happy.
It might also be a good time to think about general internet coverage in the property. Running ethernet cable is better done before decorating rather than afterwards.
Brian
