Need O2 UK APN details for data only SIM

I’ve got an O2 data only SIM that I usually use to provide a backup data path for a LAN router. I’d like to use it with the EC25-E modem in my 3rd gen unit. However, I can’t find a set of APN string, user and password that works.

Any ideas?

Username : o2web or payandgo
Password : password