Your FTO are doing you a great dis-service. When it comes to your CPL and IR tests, on the test day the examiner is going to want you to go flying if it legal. That can mean pretty poor weather, so you need to be in a position to decide for yourself if conditions will permit your flight. If you don't have the experience of operating in marginal conditions you won't have the confidence to make the right decision. Worse still, depending on what you end up doing when you finish, if you get a job flying a light twin about, you will be expected to operate in all weathers provided it is legal. Nobody is going to thank you for refusing to fly and stranding PAX somewhere when you're legally allowed to operate.
Maybe you could have a word with them? If they are a large FTO (Oxford?) they will be experienced in training students so there might be a good reason for them doing what they're doing.