whereas my corys tend to lay them in random clutches all over the place.
If so, please start a thread about them in the Corydoras section. We'd love to follow their progress. 
???well it looks like its the angels, they are hanging around chancing everything away. i noticed, this morning that most of the eggs, have gone a brown colour, with only a few remaining a pearl colour. would it be too far off the mark to assume that the brown ones are un-fertilised? ill post a pic as soon as i can get some.
next........ what the hell do i do with them now???
thanks for all the help people, i will start a thread keeping you all up to date!

If the angels are fanning & protecting the eggs, they are angel eggs. Angels will eat cory eggs, if you see angels eating instead of protecting they are cory eggs.
Some of it depends on how close to the surface the eggs end. Angels will spawn up until their nose touches the surface, they can't go any higher. If the distance from the surface to the top of the spawn matches up with the distance between the angel's mouth & ovipositor, you have angel eggs. It does appear to have the pattern of a first spawn, not in neat rows, angel's tend to get neater with it in time. The quantity seems right as well.