Afraid to say, take the 6 months with a large pinch of salt ... my Oban excange was mooted in the first group of the Highlands & Islands FTTC upgrades - well over 2 years ago but slipped back 4 or 5 times. And a quarter or 6 months each time. Eventually got it end of September.
My ISP (correctly) advised for an Engineer install if you internals are over 7 or 8 years old. The BT guys did well, renewing cabling right back to the 'drop off point' box approx 15m away, after finding some slight corrosion (although my 21CN/ADSL speeds were always very good too), along with the new internal box, FTTC Modem & ISP supplied new router, etc - so really got my money's worth.
Very good results as the only the second customer from my the cabinet, which is just around the corner ~75m away, maxing out at 74/75/76 down and a rock solid 18.48 Mbps up (obviously on the 80/20 service). Not changed since
Good luck when it gets to you ....