Thanks for the reccomendation! After a spot of looking I managed to find the below:

https://www.banggood.com/CM621-2_4G-6CH-Microlite-DSM2-Compatible-Full-Range-Receiver-For-Radio-Transmitter-p-1007463.html?utm_design=41&utm_source=emarsys&utm_ medium=Neworder171109&utm_campaign=trigger-emarsys&utm_content=winna&sc_src=email_2675773&sc_ eh=fca1f683865145691&sc_llid=17089656&sc_lid=10522 9698&sc_uid=YeZcM2sYSy&cur_warehouse=CN

https://www.banggood.com/CM421-2_4G-4CH-Full-Range-DSM2-Compatible-Receiver-For-Radio-Transmitter-p-1015760.html?utm_design=41&utm_source=emarsys&utm_ medium=Neworder171109&utm_campaign=trigger-emarsys&utm_content=winna&sc_src=email_2675773&sc_ eh=fca1f683865145691&sc_llid=17089656&sc_lid=10522 9698&sc_uid=YeZcM2sYSy&cur_warehouse=UK

I've ordered both to see how I get on with them and how many channels I'll actually need. Stay tuned! (This will most likely be updated in my build diary haha).