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Serpent Trail 100k
Freedom racing offer this 100k (1785m ascent) race along the Serpent Trail from Haslemere in Surrey to Peteresfield. The Serpent Trail is a marked route, but on race day extra signage is added by the race organisers. There are 9 checkpoints and pacers allowed from the 50k point. Camping is available on the Friday and Saturday nights. This is a UTMB Index qualifying race.
https://www.serpenttrailrace.com/100k
Race to the Stones
Threshold Trail Series offer the 100k (1128m ascent) from Lewknor in Oxfordshire to Avebury, taking in the UNESCO World Heritage Site of Avebury stone circle. The race organisers say there is a 90% completion race with extended cut-offs making this a great option for your first 100k.
https://www.thresholdtrailseries.com/events/race-to-the-stones/
London 2 Brighton Challenge
Ultra Challenge offer this 100k (1500m ascent) from Richmond-upon-Thames to Brighton. There are options on this race to run it as a continuous challenge or camp at halfway and complete the distance over two days. There are snacks and drinks available every 10-15km. This is a UTMB Index qualifying race.
https://www.ultrachallenge.com/london-2-brighton-challenge/
Thames Path Ultra
Another offering from Ultra Challenge, this 100km (350m ascent) race might be more appealing to runners who prefer less of a climb. As with other Ultra Challenge events there's the option to complete the race in one day, or camp overnight and cover the distance over two days.
https://www.ultrachallenge.com/thames-path-challenge/
South Downs 100k
UK Ultra offer this 100km (around 2400m ascent) race from Arundel in West Sussex to Eastbourne along the South Downs Way. There are 8 checkpoints along the way. The race gives points towards the UTMB index.
https://www.ukultra.co.uk/100k/
Isle of Wight Challenge
Ultra Challenge offer this 106km (2080m ascent) race along the coastal path of the Isle of Wight. As with other Ultra Challenge events there are snacks and drinks every 10-15km and the option to split the race distance over two days. This is a UTMB Index qualifying race.
https://www.ultrachallenge.com/isle-of-wight-challenge/
Race to the King
Threshold Trail Series offer this 100km (around 1400m ascent) race starting and finishing at Goodwood Racecourse in Chichester, West Sussex. There are snacks and drinks every 10-15km with a figure-of-eight loop to make navigation as easy as possible.
https://www.thresholdtrailseries.com/events/race-to-the-king/