Sunricher 
they are the ZigBee 3.0 equivalent and are supported. Sunricher is who makes them but there is loads of white label companies who sell them under a different name. That's what I would be using now.
@GALLA_4 as a sparkly I would do something like @djashones is saying, if you don't have a neutral is always better to have one. So in your case that means you only have a single twin and earth cable at your switch which can still be used with a dumb retractable switch (look for click mini grid stuff for that) then install the module behind the ceiling rose. Your best bet if possible is to install a fast fix box (round or square depending on space) behind the fitting and install all the stuff in there, then the switch will connect to that and it will work with or without the hub (definitely a plus).
