The HSE has recently made many of its previously priced publications available for free download which is great news for us!

For example:
You can download Essentials of Health and Safety at Work (Fourth edition) for free here.
You can download Workplace (Health, Safety and Welfare) Regulations 1992 Approved Code of Practice for free here.
You can download The HSE Event Safety Guide for free here.

Finding the free publications seems to be a bit hit and miss as there doesn't seem currently to be a single list of titles on the HSE website. However, if you have a good browse you're bound to find something of use as apparently hundreds of previously priced documents are now available for free download.