I'm not aware of any services that does that, but you can try the following:
1. Move this topic to the services board, and edit your post (add more details about the site, amount, etc.) but I don't think you'll find someone who will do it for 1:1.
2. Contact shasan:
https://bitcointalk.org/index.php?topic=5102555.0 He have Skrill funds, so he might be able to help you.
You didn't mention which service you're trying to pay, but if it's a known one, try to look into
these sites, they might have gift cards for it.
Also, if the amount is lower than 50 GBP and credit cards are accepted, you can buy VCCs from Coinsbee and pay for your invoice.