I would be looking for a drop to the skirting behind the wall if the loft allows for it. Usually easier to drop into existing spaces. I installed my BB extension six inches to the left of a power socket. Running that cable to that point took about a minute (the other end of the cable was a nightmare, but that was due to horizontal wood in the way).
If the drops are possible, you get a couple of module plates which look nice and prfessional on the wall. No cables on skirting or under carpets etc. If you really want Gigabit, you'll need to get CAT5E (not CAT5), or CAT6 (requiring CAT6 RJ-45 boots). Have a think. I'm 20+ miles North so there might be the option for a visit. You in a rush?
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