@Tony thanks for your reply. I got in touch with tplink support in both NL and DE. Uk tplink didn't wanted to help as I'm not living there. After trying a few recommendations with DHCP ranges etc....

@Tony Hi , Looks like I spoke too soon. Even with a main router DHCP pool of .2 to .199, I now still get no outbound internet with DHCP off in the Extender. It worked for around 10 mins last night as...

@Tony Sorry had a typo in the other rpost. My main router DHCP range started at 2 not 1. But it did go up to 254. I brought it down to 199 and now everything is working! Many thanks for your help...

@Tony have the same issue on the same RE455 extender - see https://community.tp-link.com/en/home/forum/topic/225622?page=1