With the help and advice given on this thread I now have VLANS with bridge filtering. (Diagram below)
I have a few wired clients and when they download from the WAN at the maximum speed of my connection (110Mbps), my hAP AC cpu reaches 100%.
All the configuration so far is based upon this forums excellent VLAN guide.
There has been a suggestion that it may now be possible to optimise things further.
So is it possible to now implement hardware offload on the wired clients by using the switch chip, keeping the wireless config. as it is? Or am I barking up the wrong tree?
Now I know that this setup works (tested with hex RB as the AP) I plan to buy a hAP AC2 as the AP, so another option would be to use that as the main router and hAP AC as the AP. I am however keen to learn what configuration options are available.