I managed to borrow an SDRPlay SDRdx which has better specs to the RTL SDR v4 and HackRF One. In particular I was interested in the larger 14-bit ADC that may help me with the NOAA reception so close to an FM transmitter.
After plugging in I couldnt see it in SatDump as a source, though the docs say it is supported. Therefore I downloaded SDR Connect
During the installation it mentioned installing soem drivers for the SRDPlay so this looked promising. Within Device Manager the SDRplay RSPdx was showing under Software Defined Radio. Folowing a restart of SatDump I still couldn't see it as a source, however I opened SDRconnect and it could successfully connect to the receiver.
It seems SatDump uses the sdrplay_api.dll to interface, this file is in my Satdump directory. I installed the SDRPlay API and could se the SDRplayAPIService running in TaskManager/Services.
Following a restart of SatDump the receiver was available and streaming ok. The likelihood is I just needed the API installing.