This at about 2minutes in is very much like what i witnessed, no pulsating though and a bit smaller I think
https://www.youtube.com/watch?v=kpR_ghsM3vo
here is one of the accounts I posted on net.
http://www.uk-ufo.co.uk/whitby-yorkshire-around-2003/
a couple more here I found that look like them/it
http://www.agoracosmopolitan.com/new...newnan-ga.html
http://www.latest-ufo-sightings.net/...orado-ufos.png