Hi everyone, sorry I haven't been back to thank you all before now. I've not been on the computer for a few days and find it a bit more difficult to check the forum on my phone (although hopefully there'll be a better way now that the forums have changed - but that's another topic!)
Thanks for everyone's replies and thanks so much for asking for me Carrie
We're there from 20-25 March so definitely out of season and I think
I'm right in saying that there aren't any school holidays at that time.
One of my reasons for wondering about just doing a dessert and drink was that it would take less time than having a full meal and given that the Studios isn't open very late, we don't usually have our main meal that early. Plus I've read a few reports of service being a bit slow in there.
But I think it looks like a fab place (from what I've seen through the windows after being on Ratatouille!

) so dessert and a drink would have been a great solution.
But like Carrie says, I could
eventually give it a try!

And I've not experienced the Blue Lagoon before (apart from sailing past it) so that could be worth a try too!