'Ere, I thought that ground reflections never made it to the displays because they don't move -- no doppler, no show. At least, that's what I was told when I was shown around a radar factory.
I do know that radio conditions are reasonably messy at the moment, and you can get anomalous propagation that increases clutter and false returns. Perhaps it's something to do with the sunspot peak and associated events...
Does the 50cm radar at LHR suffer from this particularly?
R