I use a Godox Ving 860 with my Canon 6d and I love it. I bought the Godox because I broke my 430ex 11 and was skint at the time so had to buy a budget flash. I was so impressed with the Godox I have since bought three more so I can gang 3 together hand have an on camera fill as well.

If you want 10-14 on a full frame the Canon 8-15 fisheye is a great lens. Okay there is distortion (it is a fish eye after all) but if your photographing the nightsky this should not be an issue. I love my Canon 8-15 (I use it on a 6d) and the quirky shots when you go full fisheye are awesome.

A fellow Norfolk man - I look forward to seeing some of your photos. I live in the heart of the Norfolk Broads so have access to some stunning scenery myself!