Why don't we just ban EU meat products being imported inot the UK as it all seems to originate from Poland and Rumania. They did it to us with the BSE problem.
Because, as the FSA keep reiterating, there is NO health hazard.
Therefore, its a no-story. Beyond the fact that the ingredients on side of box are not the entire truth (but for processed food, that has been the case for many, many, many years).
That depends on what drugs have been used on horses eg phenylbutazone, Bute for inflamation which is banned from the food chain 
If people in the supply chain are prepared to put in horse as beef, does anyone really think they will give a monkeys what the animal (horse or cow) has been pumped full of 
So surely, it matters not if its horse, cow, pig, sheep, poultry. The issue is "is it safe?". Which the FSA say it is. TBH, its probably a lot safer than the other shite they have been passing as "meat" for the last 15yrs in processed food.
I was reading a comment on the DT from somebody that keeps horses and he said there are two loop holes, one is getting another passport for a horse if the original passport is stamped "not fit for human consumption" or if the horse has been injected with pain killers the vet should stamp the passport with this, but many horse owners will have temporally mislaid the horse's passport as in both cases a horse fit for human consumption is worth much more than one that isn't.
Apparently the painkiller Bute never leaves the horses system once it has been injected and small amounts can be fatal to humans, especially children.
So, it seems that there are major loop holes and testing must be done by the food manufacturers on all the beef that they use in their processed products. I suspect that this is a massive money earner for organised crime as horse meat is much, much cheaper than beef. I wonder how involved the Russian, Albanian and Italian mafia are?