Gateway 97.8 serves Basildon. It is an Ofcom-licensed community station, and this is what it publishes about taking music from artists.
Status
Accepting
How they take music
Email
What they ask for
Unsigned Artists - [contact on your sheet]. (The same contact list also names a separate route: "Programming & Music Submissions".)
The exact submission address or form is on your sheet, not on this page. That is deliberate: a station that publishes an address for artists should not have it republished where it can be harvested.
Rotation's free sheet is U.S. radio: 1363 stations, none of which has a rule about what country you are in. A UK artist can use it as it stands.