Hmm. A 18 character three word brandable, brand infringing domain with zero UK searches.
I'm going on a zero valuation for this one I'm afraid.
Saying that, you might be able to sell it to someone and get your reg fee back, you never know, not everyone works the numbers.
BTW, registering other people's taglines probably isn't a good idea, as they are often classed as service marks, so the name got "extra" nil points on that score.