Not currently in stock but will ship as soon as back in stock..
I have been looking for a cheap smart plug as I've got an Amazon Echo and came across these. They have been priced a little lower but they were only compatible via IFTTT and now they are compatible as a skill via Alexa. I've spoken to technical support @ Energenie to comfirm.
Gateway required @44.98 so this works out cheaper if you require several sockets https://www.amazon.co.uk/gp/product/B00V52HTXS/ref=s9_acsd_hps_bw_c_x_5_w