Once he reached Chester it appears Richard II was treated less courteously. According to Creton he was confined to a room and attended by the sons of Arundel and Gloucester. There's nothing implausible about Thomas Fitzalan being chosen for this job, but most sources agree that Humphrey of Gloucester had been left behind (with Bolingbroke's son, the future Henry V) at Trim Castle in Ireland, where he died at about this time. It's just possible that Creton got mixed up with Thomas Despenser, Earl of Gloucester, which would put a slightly different slant on things, but it seems unlikely.
On at least one occasion on the journey to London the men of Chester (or the Welsh - take your pick) tried to rescue King Richard. It's the sort of thing that Robin Hood would have accomplished at the drop of a feathered hat, but these guys messed up and it just led to Richard being more carefully guarded.
It was about this time that Henry sent off for monastic chronicles, with a view to finding precedents for deposing the King. From subsequent evidence, it appears he was also hoping to find some backing for the absurd 'legend' that Edward I was not Henry III's eldest son! Henry affected to believe Edmund Earl of Lancaster (his ancestor on his mother's side) was the real eldest son, but had been passed over because of some imaginary defect. I need hardly add that this 'legend' was total poppycock, and if Bolingbroke truly believed it, he must have been deranged. I doubt he did, but perhaps thought the mugs might swallow it.
And to think some people say Richard III's claim to the throne was dodgy!