Update homepage promo. For deploy 20th October.

For the keep warm this winter campaign update one of the homepage promo slots.

![screen shot 2014-10-15 at 14 06 50](https://cloud.githubusercontent.com/assets/35035/4645742/a135cc06-546c-11e4-90dd-a1a22b791e3c.png)

Also removed a collection of old unused images and further optimised the tax image.

- [ ] Dev Review
- [ ] It is 20th October