Thank you :) I'm a complete amateur and the light conditions where I live (about 10 miles from Central London) mean my photos normally suffer from way too much light pollution.
Just realised that the photos were not zoomable - have edited the post so they can be clicked for full-res.
Also made a quick "How to" guide for those wishing to embed zoomable/clickable images: https://steemit.com/image/@boarddavid/inserting-zoomable-images-on-your-steemit-post