I don't know your budget so I'll try give you a range of laptops:
This one is quite pricey but also very powerful and should run most AAA games and WoW at high settings and high FPS: https://www.amazon.co.uk/Dell-InfinityEdge-Ultrabook-i7-6700HQ-Windows/dp/B018FSX9GA/ref=sr_1_1?s=computers&ie=UTF8&qid=1499253136&sr=1-1
The cheaper brother of the last one but still very good: https://www.amazon.co.uk/Dell-13-3-Inch-Ultrabook-Integrated-Professional/dp/B00T9RSZ9I/ref=sr_1_7?s=computers&ie=UTF8&qid=1499253136&sr=1-7
This one is about the same price but from what I've heard a little better battery: https://www.amazon.co.uk/ASUS-GL552VW-DM195T-i5-6300HQ-GTX960M-Backpack/dp/B01N21B4FP/ref=lp_12123675031_1_1?s=computers&ie=UTF8&qid=1499257461&sr=1-1
This one is a much cheaper one but comes with the toll of having older specs, might not run AAA at good fps (maybe 30 at low settings maybe) but WoW should run fine: https://www.amazon.co.uk/Dell-Inspiron-Laptop-Pentium-Windows/dp/B01N9OJEE3/ref=sr_1_1?s=computers&ie=UTF8&qid=1499257538&sr=1-1&th=1
A pretty standard laptop: https://www.amazon.co.uk/ASUS-VivoBook-X540SA-XX345T-Notebook-Processor/dp/B01KLGDHSE/ref=sr_1_36?s=computers&ie=UTF8&qid=1499257633&sr=1-36
I hope this helps, I don't know WoW that well and played it once a very long time ago, so I'm not very certain on what you need to run it but from what the internet says but I always find that to be wrong a little.
EDIT: Now that you've said your budget I would recommend something like this: https://www.amazon.co.uk/ASUS-G752VS-GC054T-i7-6820HK-Storage-Backpack/dp/B01JIS78PY/ref=lp_12121689031_1_1?s=computers&ie=UTF8&qid=1499257846&sr=1-1 It's a very very powerful laptop.