In the end I went with this one for £11.00 from a UK seller:
![[Linked Image]](https://i.ibb.co/QprS314/enclosed-and-vented.jpg)
* Internal forward & reverse relays so the original Lorlin 1a rotary fan switch can be used
* Easy to wire in the original fan switch
* Remote pot
* Rated 40a (30a continuous)
* Vented enclosure
Obviously I just need the forward circuit, but the forward and reverse versions use relays which I prefer given I want to use the original Lorlin 1a rotary fan switch.
Search eBay item number: 204515866552