Hey, I said I'd return to let you know how I got on.
Back again after using UKLash since the beginning of January. I still had short, patchy lashes after using lash extensions last summer. For me, UKLash has worked wonders. Especially with my outer lashes but I can't even see where my short gaps were, the whole lashes are a consistent length.
No side effects yet and sometimes I've forgot to use it a night here and a night there. Can also recommend the UKLash lengthening mascara. Doesn't get dry/clumpy so I'm not tempted to 'pick' it when I'm tired and it comes off clean in the shower. Instead of smudging, it just comes cleanly away.