LBJ

Dunnocks are being very vocal recently, setting up home.  Did it look like this?

I had first thought it might be a dunnock but it didn't look so grey, perhaps it was the light. It looked quite speckly on its tummy near its tail, which it looks perhaps like the dunnock possibly has. I have generally thought the dunnock has a bit of a scrabbly scratchy song and this sounded very sweet and beautiful. I think it's most likely it was a dunnock! Thank you for responding so quickly. Really enjoying birding at the moment, definitely a brilliant antidote to the corona crisis

At least being out in the fresh air you're away from too many bugs! Well, apart from the ones with lots of legs and wings of course :-)

Dunnocks do sing beautifully, suprisingly so. Their appearance does depend on age, time of year and lighting conditions so song, habitat, shape and behavior all help with identity. Perry Lane (which runs past the visitor centre back to the car park) is one of the places you're most likely to see or hear one. Putting all this together, it is pretty likely that's what you saw. The trick will be to repeat (when its sensible) your observation and reassure yourself that you can ID Dunnocks with ease. Enjoy your birding.

That's really helpful info and advice. Thank you so much!