Well imv this is two part question ~
UK revival of what do you mean?

The original revival was grass roots singers in smokey pubs booking acts who were singing a mixture of traditional and pub songs and appreciative audience, though many for the beer and socialising on a Saturday night (for example)

Latterly commercial concert style clubs were able to be a bit more picky and booked more trusted acts that were gaining popularity for what they did

Adverting and the popularisation of the venue as ever very important

As an off shoot of this reading the vinyl sleeve notes and looking for the source singers (traddy) in my case set the likes of me looking for wider sources and learning what it's all about

So are the current 2023 doing the same? By and large yes and there is vast amount of material both traditional and singr song writer

I think that it is still important to listen to the established acts of the last 50 years, BUT look for the SOURCE singers/players as the blank page in a book of which there are many overlooks the "way" the original source singers actually delivered the words this is important

So their way or your way but be aware

Once the genre has been established it seems many current revivalists go the way of singer song writers as money can only flow from PRS which seems to be a broken piece of legislation ~and from sale of CDs

So where do Agentscome into all of this?

Looks to me that the scene fed by interest created and not so much by the folk club scene who want to do their own thing, but by concert clubs and the like

Agents? not sure if they do much to promote venues? but no doubt some one is and establishing the security overall of income needed to generate a living for the professional artists ~ it is hard life on the road and not secure ~ many continue to be part time and find other employment to supplement their living costs