[user104658]

Originally Posted by smudgie

I just don't understand how if all this evidence was true, why weren't they charged, home or abroad?

Under normal circumstances I am convinced that they would eventually have been charged in Portugal (e.g. if they were a Portuguese couple). It's the fact that they were a British couple on holiday abroad that muddied the waters. All sorts of people / agencies got involved and the whole thing became a tangled web very quickly.