Okay, so life got in the way of this one for a while. It's in the keg now though, and I've got the first pint sat next to me now.
I think I'd class it as a partial success
The bitterness needs taming - should be easy to address that in future brews.
Lemondrop was, perhaps, not the best choice of hops. It's distinctly lemony and the smell is slightly reminiscent of fairy liquid. Thinking about it, I'm not sure exactly what I was expecting. Again, easy to address in future - think I'd be tempted to try something with more of an exotic fruit vibe, I've got a bag of tropical england hop mix from CML that could be interesting.
It's definitely a bit thin and lacking in body but nowhere near as bad as I thought it might be. I could up the lactose a bit but I don't think I can mash much higher. A trickier issue to tackle but if I can get the bitterness and hop selection right I don't think it's a major issue.
I, unfortunately, don't have an abundance of positive points but the one good point I have hopefully balances out the issues - it hits the spot in terms of looking, tasting and drinking like a beer. Not sure anyone would mistake it for a "standard" ABV beer and I'm not happy enough with it to start handing out samples to find out. Hopefully, the next iteration will sort out the bitterness and use more suitable hops and I can get some feedback then.