I purchased 2 off the internet (59p each I think it was) & tried for at least 2 hours to fit them and then had a look on the internet and people were saying just as you mention that they can be unsuitable and quite often not even fit. It goes to show that money saving gadgets can often cost you in the long run... in my case it was £1.18 lol. Thankfully it wasn't the £7.99 + £1.53 it would of cost me off Bid if I had purchased via the phone.
I take comfort in the fact that Bid TV need much more than a shitty valve to remove the pressure they must get from their bankers.
They must be positively blowing a gasket :mysmilie_19: