We will be in London the first week of October and are planning a day trip to Bath. Should we buy our tickets ahead of time? I would rather wait so that we can be flexible on days, but I don't know if we would save money by booking early. I find the National Rail site confusing on this issue. The cheapest tickets I see are 24 pounds each way. But maybe I have the wrong destination. You are given a choice of Bath Spa or Bath Gate stations. Help!