I have the Abus WA50 wall anchor and it seems to be a good bit of kit. Comes in at £23.70 here: http://www.amazon.co.uk/Abus-WA50-Wall-Anchor/dp/B00R4HRB9K . Review here: http://www.bikeradar.com/gear/category/accessories/locks/product/review-abus-abus-wa50-wall-anchor-39858/
You’ll need to ensure that any heavy duty chain you buy isn’t wider than the opening in the anchor (I fit a D lock into mine so not an issue). The fixing bolts that come with the anchor are quite long at around 115mm so you need to make sure the wall you’re fixing to is deep enough. Required to fit are a long 10mm and standard length 16mm masonry drill bits.
If you need something more meaty then might be worth looking at the Abus WA100 or the Kryptonite Stronghold.
Abus WA100 comes in at around £55: http://www.wiggle.co.uk/abus-wba100-ground-anchor/. Apart from being quite a bit larger and burlier than the WA50, it has a bigger opening for a large diameter chain. Standard 16mm masonry bit required.
The Kryptonite Stronghold Ground anchor is coming in at a very reasonable £45: http://www.wiggle.co.uk/kryptonite-stronghold-surface-ground-anchor/, and comes with necessary drill bits. This review gives plenty of detail: http://www.bikeradar.com/gear/category/accessories/locks/product/review-kryptonite-stronghold-ground-anchor-19280/ .
Plenty of YouTube videos on these which gives an idea of their size (which stand alone pics don’t), and details of the fixings.
HTH