Two questions, first is what do you want to do about this? fix the problem or leave? To fix the noise, you need to convience the Landlord to soundproof their floor or your ceiling. To leave is the simpler solution as you would claim a breach of the "covenant of quiet enjoyment". Give the landlord written notice with deadline. After deadline, move out giving LL opportunity for final inspection. Then make demand for deposits and if appropriate, the cost of moving and difference between old and new rent, until the end of this term.