My friend's neighbor turned out to be a pedophile who left the state, and was caught several states away by U.S. Marshals. He's isolated from other inmates now, but there's no proof he molested anyone (this time), only a few counts of possession/transmitting/receiving CP. Either way, he's kept in a separate ward, with other chomos, ex-cops, and rats/snitches, away from General Population.
Even if Sick Nick does get only 25 years, I seriously doubt the prison system would put him near anyone likely to harm him. Also, reminds me of that autistic Sonic nut PaulAndAmy. (Kiwis look him up) I don't know how the UK prison system is compared to the US one, but I'm not sure they separate pedophiles from the other inmates there.
Say what you will about what Sick Nick deserves, but at the end of the day, I'm not so sure it's going to happen.