The Bookeo plugin is not listed on www.remarpro.com, so your best bet is to contact Bookeo for help with this. You might also reach out to the author of your slider plugin. Which are you using?
I see this error in the inspector:
Uncaught TypeError: Cannot read property '' of undefined
at a.fn.init.a.fn.slick (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/lib/slick/slick.min.js?ver=1.6.0:18:9421)
at o.initSlider (https://energy-academy.co.uk/wp-content/plugins/elementor-pro/assets/js/frontend.min.js?ver=1.9.5:2:30587)
at o.function.i.(anonymous function) [as initSlider] (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:32044)
at onInit (https://energy-academy.co.uk/wp-content/plugins/elementor-pro/assets/js/frontend.min.js?ver=1.9.5:2:31089)
at o.function.i.(anonymous function) [as onInit] (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:32044)
at o.trigger (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:33010)
at o.function.i.(anonymous function) [as trigger] (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:32044)
at o.i (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:33109)
at o (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:33295)
at o [as constructor] (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:33295)
at new o (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:33295)
at t.exports (https://energy-academy.co.uk/wp-content/plugins/elementor-pro/assets/js/frontend.min.js?ver=1.9.5:2:31267)
at i (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:30662)
at Object.doAction (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:31228)
at i.runReadyTrigger (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:1974)
at HTMLDivElement.<anonymous> (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:1573)
at Function.each (https://energy-academy.co.uk/wp-includes/js/jquery/jquery.js?ver=1.12.4:2:2881)
at a.fn.init.each (https://energy-academy.co.uk/wp-includes/js/jquery/jquery.js?ver=1.12.4:2:846)
at s (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:1555)
at initHandlers (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:1638)
at new i (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:2052)
at g (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:3349)
at HTMLDocument.init (https://energy-academy.co.uk/wp-content/plugins/elementor/assets/js/frontend.min.js?ver=1.8.1:2:3673)
at i (https://energy-academy.co.uk/wp-includes/js/jquery/jquery.js?ver=1.12.4:2:27449)
at Object.fireWith [as resolveWith] (https://energy-academy.co.uk/wp-includes/js/jquery/jquery.js?ver=1.12.4:2:28213)
at Function.ready (https://energy-academy.co.uk/wp-includes/js/jquery/jquery.js?ver=1.12.4:2:30006)
at HTMLDocument.K (https://energy-academy.co.uk/wp-includes/js/jquery/jquery.js?ver=1.12.4:2:30368)