I was too as I had it for the Unibet 15 to Go offer.
Had a good day on that offer & managed a couple of £10 2nd place refunds, one with WH & one with Skybet on the 1:50 race offer. Lazuli let me down with Paddy Power on the same race lol.
Have a look in your account with Paddy to see if there is a £5 free bet for I think the 1.50 at Royal Ascot tomorrow. I saw a comment elsewhere saying there was one hidden in the promotions but not on a banner at that time.
I recently joined Prize Rebel.
It's a bit like Swagbucks but has a cleaner more organised look imo.
Why not take a look.
If you decide to join feel free to use my referral link which is - https://www.prizerebel.com/index.php?r=10498953
I'd never heard of Heads and Heads either. My initial thoughts are that it looks like a hybrid of Team Profit & one of the premium services. There is a free download on there which would certainly get you on your way if you were new to it
Sorry I wasn't online to answer that question earlier. I hope it worked out ok. If you did £20 in the blue box on Betfair & then laid on another exchange (the right sided box) only one outcome can win. Hopefully you did this & got a £20 free bet?