New £500k bonus re G.National...

these days how likely is it the winner of those races even gets in the national?

Not sure many Irish runners will bother giving away the handicap mark for those.

Good publicity for Hills as the bonus will be mentioned many times on National Day, assuming these winners line up, and the chances are Hills will not have to pay out.

It is not really clear what racing gets out of it, though, but trebles all round for the Hills marketing team.

the rp piece did mention the last horse to do it was 2017

One For Arthur won the Warwick Classic then the Aintree National.

OFA 148...2lb above the ratings floor in both years its been 34 runners

I wouldn't bet evens the warwick classic chase winner is rated high enough
same for haydock & the becher

The Haydock race could have a bumper turn out as the National weights are usually done before it. As Ramruma said not sure how racing benefits, just shows how much bookmakers can afford to waste, that David Power jockey rubbish last year was another one.
After Cheltenham is soon enough for the National weights to be revealed, not 2 months before the race.

And,Bet Baldy is offering £1,000,000 bonus that Elvis alive and living on the Moon