As to how I like the WM1A compared to the Lotoo Paw Gold, I don't hear any obvious sound quality difference between the two devices, so it comes down to things like UI which is better on the Sony and also the battery life which is considerably better. The Paw Gold wins out for storage however. Ultimately and the real decider for me was cost, with the WM1A coming in at half the price of the Paw gold, buying from Amazon warehouse.
As I mentioned I'm super busy at the moment so I wouldn't have time to get over to South London, but you're more than welcome to come East if you want to try it out. You can pop over to my office most days of the week. Just give me a heads up first.