Today I rode a LibrtyBus in Jersey, Chanel Islands into town and back. With only single digit number of cases at large on the island, most passengers were foregoing the recommended face coverings. I was less comfortable with most of the windows being shut on the return journey, which is contrary to the operator's policy.
I live at the rural end of what is a typical provincial bus network that radiates from town into country. The impression was that there were the normal number (maybe actually more, due to school situation) of people boarding at the country end but that the town end where most passengers would be collected was quieter. Busses are capped here at 50% occupancy, and was close to that limit at the start of the return trip. Both my trips were off peak, mid-morning inwards, lunchtime homebound.
Based on my experience, I feel that reports of the death of the UK's public transport system have been greatly exaggerated. I suspect that as anxiety deceases and social and economic activity returns, so will the travel, whether operators like it on not. We are perhaps a month of two ahead of the mainland. It is worth noting that, whilst on an island that effectively contained its outbreak, the official advice is still to avoid busses where alternatives are available, and experience suggests them now being used quite normally.