Andy,
Oh dear not good news then, when the HUDL2 came out some customers were having problems using Sky Go and others it worked ok. We never was able to work out why some did and others didn't not. Some returned them and had replacements but that again was hit and miss, then the app was updated and no feedback that the HUDL2 had problems again until you. You've not done any mods to the Tab or firmware?
Oh dear not good news then, when the HUDL2 came out some customers were having problems using Sky Go and others it worked ok. We never was able to work out why some did and others didn't not. Some returned them and had replacements but that again was hit and miss, then the app was updated and no feedback that the HUDL2 had problems again until you. You've not done any mods to the Tab or firmware?