I was on National Express coaches last week, From Tiverton to London return and London-Glasgow return, The 502 Tiverton-London Return, were not up to half capacity, the 595 London-Glasgow return, both ways was full to half capacity, as required by social distancing.
The fares were pretty expensive on all sections, as one is paying for 2 seats due to Covid, Tiverton-London was £15.60, London-Glasgow was £38.00 both ways, and London-Tiverton was £24.00, so not exactly cheap, which has put me off doing overnight Exeter-London National Express, for train day out from London, as looking at over £54.00 return, which too me is pricey, as few weeks back got a £24.00 advance single, Tiverton Parkway to Paddington, so if can get train that price, then no brainier use the train.