CrossRoads:
Heatsink pads - I fake those in eagle by giving the polygon pads the same name as the signal on the board drawing, then you can overlap them. Will get overlap errors when you run the DRC that you can ignore.
You're a star - cheers. I'll give it a try later.
EDIT - I have just tried it, no success. I've checked the pad I'm trying to connect my polygon to is named VCC (in this case), I've made an overlapping polygon onto this VCC pad.
I tried renaming it by Right Click > Properties > Name, but it told me to use the name command, so I did and have successfully changed the name of the pad to VCC. However, if I rename the pad to VCC and then try to fill it using ratsnest, nothing happens? The polygon just remains an empty space outlined with dashes.
If I leave the name unchanged, and click ratsnet - great, it fills it - but leaves a gap between the polygon and the pad - defeating the point of being a heatsink. Any ideas? Here's some screenshots.