& they only have to come from Sussex or the continent:
https://www.mammal.org.uk/wp-content/uploads/2016/06/SE-Mammal-Atlas-5-Bats.pdf
Recorded just outside Kent in previous survey (possibly St Clement's Caves at Hastings, currently trading as Smugglers Adventure):
http://s420601879.websitehome.co.uk/wordpress/wp-content/uploads/2013/02/Bat_Atlas_20001.pdf