Hi all, sorted!!!!
Finally got round to it and for some weird reason it was so easy to get to work, even though I tried all of this before and it didn't work!
So used the laptop to connect to the dongle went to STA interface setting and simply typed in the SSID for the new 4G router, left the security mode and encryption as is, then manually entered the password.
Then moved to device management and carried out a reboot. This is where it always failed recently, but this time it all worked perfectly and I'm now back online 👍
@Windy Miller I was with EE for broadband and mobile, but Broadband was barely over 5mb speeds and would continuously drop. So have now moved to EE 4g and was sent a little router with SIM, took a while to work out best house location, but now averaging 40mb speeds