Volunteering at Childline - travel expenses?

Hi. I really want to volunteer with either Childline or the Samaritans. I'd like to work in administration. I'm just wondering if these organisations will pay travel expenses though? I know that both reimburse travel costs when actually working, but I've read that there may be a large amount of training sessions. Would the cost of travelling for these training sessions be reimbursed as well? I have to rely on public transport, and the cost of a bus is about �5 now so I have to be a bit wary, still trying to get a job. Thanks.