A bit more from the OED website:
"Nearly all public libraries in England, Scotland, and Wales— and all in Northern Ireland—subscribe to the Oxford English Dictionary online. This means you can access the dictionary, free, via your local library. Find out more.
Most libraries also offer ‘remote access’. This means that, if you are a member of your local library, you can access the OED online free anywhere you have internet access. Just enter your library membership number (on your library card) in the box provided at www.oed.com."