Rupert, thank you for the list you provided. I went through these and its not quite what I've been looking for. We have a nice tool in Poland called Whitepress, they cooperate with plenty of local online news channels, hundreds of them really and I can check their domain authority and other parameters and submit sponsored article where I describe what my company does and what service we offer. There isnt any plan, we just pay for articles when we sumbit them.

I was looking for the equivalent in the UK and I struggle to find one. Whenever I go to local news channels like yorkshireeveningpost.co.uk and other similar ones, they all have "Advertise with us" sites, but it not really time efficient to go though them spearately instead of having them in one place.

Same here! It would be extremely useful to have publishers gathered on one website and be able to submit articles.