There will be a total lunar eclipse in Europe on Friday 27 July 2018. The eclipse will be visible in the United Kingdom between 8.49pm and 11.19pm and hence Namaze-e-Ayat is Wajib between these times.
For certainty, mu’mineen are advised to pray Namaz-e-Ayat after Maghribayn prayers. The eclipse times in your area can be found at www.timeanddate.com