Talk of trials day going ahead with spectators is living in a fantasy land, and quite short sighted with a view to March IMO.
The Gov are panicking about Xmas and so they should be - it's the one time of year where everyone is socialising, drinking, meeting. It's inevitable that cases will sharply rise, and it will be impossible for the Government to know the toll of everyone meeting between the 20th-30th because their testing system is shit - hence the reason why a 25 day national lockdown post xmas is already being discussed for January, because they know tracking cases over Xmas is going to be a nightmare. I know the Government are utterly inept, but on what planet are they going to think:
'Let's start the year by getting racing fans back to a place where we copped untold amounts of shit for letting it go ahead in March'. I simply don't see them being that stupid.
More importantly, with a high likelihood of a post xmas spike, why on earth would Cheltenham racecourse want to potentially put themselves back in the firing line after the complete shit storm that followed March?
IMO the festival is over for spectators, but IF there's any chance of people being at back at Cheltenham in March, Cheltenham cannot afford any slip ups or negative publicity beforehand. In the wake of post-xmas Covid fallout, it would be the height of commercial stupidity to potentially jeopardise a Festival that brings in hundreds of millions of pounds, to let a tiny number of people experience trials day. Nobody will know who has what post xmas, so it doesn't make sense from a public health perspective either, and it doesn't even make sense as a trial - the whole 'but this will prove racing is safe for spectators in March' argument holds zero weight as any number allowed in for trials day would be numerically insignificant in comparison to March.