Sengled Element Classic Smart E27 Base, Dimmable LED Light Soft White 2700K 60W Equivalent, Starter Kit (2 A60 Bulbs + hub) - £9.53 @ Amazon (cheaper via Amazon Business)
Unsure if these are ZigBee compatible - there is a question on the page that suggests they are, in which case they're a real bargain compared to Philips Hue lights.
I've ordered a set to test out.
* Please note that all prices are correct at the time of posting. However prices can vary quickly and significantly without warning.