@Solla-topee thank you very much for the reply. I will get you these details today. I just have a couple questions. 
 

for number 2. Do I need to disconnect all devices from wireless and connect the laptop to the AX11000 by Ethernet cable, or wirelessly?

and for number 4. I'm not to sure whether I enabled QoS, but I did specifiy the internet to be for gaming under the QoS option, becuase I was getting latency spikes while playing call of duty. Do I need to return the settings to normal?

here is the speed on my laptop at the moment (wireless)

i will get you other speeds today. Thank you 

@Solla-topee okay mate, I went out today and purchased an adaptor so I could connect my MacBook to the internet wirelessly.

I couldn't connect my laptop the modem directly, but when I disconnected all wireless devices and connected my laptop directly to the router, here are the three photos. It's very strange as it started high, then dropped right down to very slow speeds considering what I should be getting.

i have also attached my wired connection speeds, I wasn't sure what Ethernet it was so I've attached both photos.
 

I spoke to some one today at the electronics store and he said there's no way I should be getting these speeds, he said I need to call TP link and perhaps change some settings. Otherwise I may need to bring it back into the store as it could be faulty. Is there a number I can call some one ?

thanks for your help mate, I appreciate it!

@Solla-topee  you are welcome mate, I followed your steps and I'm unsure if it worked. I am getting good speeds some times. I had 400mgps download before I left for dinner. But when I came back I was only on 80mgps. Do you think I may have a faulty router? Or is there other settings I need to change some where?

I'm having the same type of problem.  Any reccomendations? 

Laptops are speed testing 300-500, direct connection to modem is 900+ wired in. 

The PS4 is ~20-23mbps.  

@mkasa 

Im the same witrh this. Wifi I get 160mbps. via TP Link I get 30-40mbps. 

I get sometimes trhe PS4 speed test isnt great, but if I play Battlefront 2 via LAN/TP Link, I get the poor connection warning, same in Rocket League. Go on to Wifi, and I dont get those warnings.

PC which is connected via TP Link, is fine.

@Nossy12 

first buy a CAT7 cable from your fibre to the AX11000 

secound i have both Xbox One X and PS4 pro and both connected Wi-Fi  and let me tell you '

nothing to do with AX11000!

xbox x got 500/520mb out of my 500mb fiber while PS4 pro always random result ! Once 90mb then 200 then 250 and last time 50mb so i think it's something on Sony's side !

if i run speed test On my laptop always get the 500mb im paying for ! So ignore the thing and enjoy !