How about a SES to BC adapter? https://www.ebay.co.uk/i/231702542614
Wow thank you. I didn't know they did those. I'd searched the other week and only came up with the normal screw to bayonet adaptors.
Damn.. wish I'd known earlier as I would have been entitled to the half price bulb discounts when ordering the Hive heating.
This is the bulb currently in the the entrance hall. I believe they are classed as candle SES.
Hmm just thought... dont think the glass cover would go over a full size bulb despite the reflector being fully size bulb shape. If you look at the screw to the left thats where the cover attaches. I can't get up there tonight to check again, but may try have another look tomorrow if I'm more mobile. I'd previously thought a wall switch such as LightwaveRF was my only option.