In reply to a post by TheGrovesy:

@MrSaffron. Many thanks it does look like its my equipment that's the problem, I have only run the ping to the router for about 10 minutes and it sent 500 pings and only received 453 (9% loss).

The losses appear to be mainly request timed out but also I get several Destination net unreachable from a different IP (192.168.10.253) how does that happen? EDIT: this is the default address of the extender which makes sense.

The requests that did work have an average of 6ms. I assume this isn't too bad.

I'm going to bypass different pieces of equipment to find the culprit, but my money is on the cheap extender I am using.

It sounds like the extender is the issue from what you've said.
If you had a cable direct from the PC you should get zero packet loss and an average ping time of less than or equal to 1ms