Hi Luke, sorry to hear about your teething problems.
Please don't get disheartened, like you many of us have been caught out one time or another, or at least I have.
Richard mentions one of our supporters, Second Hand Darkroom Supplies. I've used them before and found them extremely reliable and helpful. All the emails and questions that l have sent have been answered promptly and fully.
Website is almost always worth a look, after all looking is free
.
Ian