Whyte rear hub – minor wobble

Have got minor wobble from side to side with rear wheel on M109C Team ’14 running rear wheel as follows:

Whyte XC-209-C Team Carbon Wheelset, 28 Straight Pull StSt spokes, 12mm E Thru, Alloy Freehub, 6 Bolt hub with double sealed cartridge bearings

Have opened it up and freehub bearing seems fine. Drive side looks like pic below, and when I pull the axle it moves a tiny bit in and out, which seems to be the amount of movement when the wheel is in the bike.

P1090615.JPG by cakefest[/url], on Flickr

How can I get the axle out to check the hub bearings?

Non-drive side looks like this but I can’t work out how to take that end cap off:

P1090613.JPG by cakefest[/url], on Flickr

Just remove the rotor and pull…? First time on new Hope hubs they are really tight, they become a tad looser after a few times.