Subsitutions for Monterey Jack cheese in the UK At one point in the US I had some Monterey Jack cheese which was tangy and yummy and delicious. 

Here in the UK they also sell cheese labelled "Monterey Jack" but it is bland and tasteless and horrid. Are there any other similar cheeses that I could use (for eg melting onto nachos, grating into burritos etc.) that would have that same tang and flavour? 

Or any UK-based suppliers of Monterey Jack that is not bland and tasteless? (I tried Sainsburys and Tescos and they are both the same).
Monterey Jack is in no way cheddar.  The advice to use Gouda was about as good as you can get. (make sure it is neither smoked nor aged).  Sainsbury has a four cheese pre-shred mix with MJ, Aged Cheddar, Edam and mozz that will approximate those four cheese mixes found in most US grocery stores and the finer 7-Elevens but MJ itself is near impossible find.