GCSE and A level results come in faster. Five months is well out of order.
If it's a private training establishment, tell them - in writing, preferably - that you will sue them in a small claims court if they do not provide you with the product you have paid for. In the same letter, tell them you will also write a formal letter of complaint to the BCS.
If it's a local college, go direct to the board of trustees/governors. Believe me, this will get things done!