The Spectroscopy of Exoplanets: Over All Wavelength conference will be held at High Leigh Conference Centre (Broxbourne, Hertfordshire), located near London.
Location (Google Maps).

See https://www.cct.org.uk/high-leigh/how-to-find-us
We kindly ask guests to make their own transfer/transport arrangements, to and from the conference centre. The closest train station is Broxbourne, and a local taxi company is Broxbourne Taxis who can be contacted via telephone on: 01992 464 007.
Local attractions:
The Lea Valley Park
Broxbourne Woods
Gunpowder Museum in Waltham Abbey
Scotts Grotto in Ware
Hertford Castle