I reckon the 65 C9 may dip below £1,800 when the 2020 models reach the shops.
Funny, I was just looking at US price trends in LG oled tvs for 2019/2020 and found the initial price points the tvs were when they came out compared to now, at least in the US.
These were printed in March 2019 and I added current prices for today.
C9 LG OLED TVs
55" OLED55C9 - $2,499 (available in April) In Feb 2020 $1200.00
65" OLED65C9 - $3,499 (available in April) In Feb 2020 $1899.99
77" OLED77C9 - $6,999 (available in May) In Feb 2020 $3899.99
E9 LG OLED TVs (glass)
55" OLED55E9 - $3,299 (available in June) In Feb 2020 $ N/A
65" OLED65E9 - $4,299 (available in April) In Feb 2020 $2099.99
W9 LG SIGNATURE OLED TVs (wallpaper)
65" OLED65W9 - $6,999 (available in June) In Feb 2020 $5999.99
77" OLED77W9 - $12,999(available in June) In Feb 2020 $9999.99
It occurred to me, some of these prices were cut in 1/2 within 10 months of release, not even a year!!
So based on this, if this remains a constant strategy then it seems the best time to buy a new tv is either Black Friday or beyond, After November prices drop significantly and if you can wait, this years X series will most likely follow the same trends.
If you know there isnt anything special coming to the lineup this year, worthy of note, then maybe buy now while they are at their lowest point.
Just by chance my wife and I have bought a new tv every 6 years to the month because we plan tv purchases around our tax returns, so we dont bother saving all year, we just plan that that particular year we will buy a new tv, our budget will be based on our return.
By doing it this way we accidentally ended up buying at the end of each items life cycle so we saved a lot of money on each purchase.
In 2008 we bought a 60" Mitsubishi dlp tv they were $1600 we got one for $800 cash
In 2014 we bought a 70" Vizio P series they were $2599.99 I paid $2000.00 cash
In 2020 we bought a 65" Lg E9 Oled they were on sale for $2999.99 but we paid $2100.00
So it just sort of worked out that way for us and we got lucky without thinking about it.