BBC Olympics on Freeview HD

Hi to all, I'm enjoying the coverage of the Olympics on the BBC overall but I'm really disappointed with the Freeview HD service. 

On FHD you get Eight extra channels which is great but I've found the picture is blocking all the time rendering the picture unwatchable. I've checked the signal strength and it's 100% on all other BBC channels but on the Olympic feeds the signal just goes up and down from Zero to around 80%. Fortunately I have a Virgin Media TiVo Box so I've tuned in there instead. It does take a minute to load up but it's very good with no problems with the picture or sound. 

I was wondering if anymore else has experienced the issues have? I live in NW England with almost clear line of sight to Winter Hill so I shouldn't be getting any problems with the picture and I've carried out a full retune on my TV too.

Cheers...