Bit of a weird one and are onto Nominet and my registar as I type. I bought a set of domains back in 2010. I transferred them to my hosting and my Nominet account. We've let a few drop but carried on with others. Just looked to see when the ones we kept expire as we have developed them and noticed the NS are the same but the owner and TAG isn't with mine no more. Bit more digging and I can see someone on here was offering them out in 2012 and so guess they are the owners. They hadn't expired and then re-registered but transferred away. Any advice welcome people!