I just finished repairing the cracks.
I put some stickytape as close as i could to the crack on all edges, to "mask" the area off.
Then whipped up some JB weld, and kept whipping till it got quite thick. then every gently applied some using a paddle-pop stick cut in half and pressed as much in to the hole i drilled as well as the crack as possible.
i wanted it thick to help prevent it running.
the after a few minutes i removed the sticky-tape and as i had masked the area off, there is a very thin grey area of JB weld left covering the cracks.
Tomorrow afternoon when i return from work, a quick hit on the dry JB weld on the bike with a Black Nicko pen, and all will be good again!