I sort of did mention which shop... but if you are exact it just comes out as stars... (not w.o.s)
finally got through and going to arrange to replace it...

i dont think its a software issue, personally...

I tried both tuners on their own, by disabling one in the menu, to be sure which one i was hitting...
both get a signal, but one has worse signal than the other, and even the best out of the two isnt as good as the single T2 tuner i had before for weaker channels...

I have checked that both have the 5v deselected (as i dont have an active antenna)
I have checked that its correctly sited so that all pins are snug into the vu+ board
I ran a new search just to make sure

its 0% SNR, and 0% AGC for tuner1 using weak channel [baytv liverpool]
if i switch tuner1 off, turn on tuner2 and tune back onto the channel i get SNR 0% and AGC jumps between 0% and 37% which means the picture is badly breaking up.
(SNR 99% and AGC 77% on BBC Four)
Switching back to the samsung tuner, no problems, SNR 50% and AGC 50% for baytv... and SNR is 99% on the BBC channels