From Wikipedia:

The Grande Traversée des Alpes (GTA) is a long-distance (630km) hiking trail in the French Alps, connecting Thonon-les-Bains on Lake Geneva with Nice.

http://www.brigantesenglishwalks.com/isaacs-tea-trail/walkinfo/

Isaac’s Tea Trail has been described as England’s last great undiscovered wilderness trek. The trail runs over 36 miles and is mainly in Northumberland and entirely within the North Pennines Area of Outstanding Natural Beauty.

http://www.northpennines.org.uk/exploring/outdoor-activities/walking/isaacs-tea-trail/

RunCalc Alpine Challenge refers to FKT on three mountains in Poland: Kasprowy Wierch, Babia Gora, Sniezka. Read more on 2016 edition page:
runcalc.byledobiec.pl/index.php?go=runcalc_alpejskie_wyzwanie_2016

https://www.nationaltrail.co.uk/hadrians-wall-path

Walk 84 miles from coast to coast following the World Heritage Site of Hadrian's Wall, past Roman settlements and forts. There's history every step of the way, and cosy pubs, bustling market towns and great views too.