So I already took a loan to buy all the equipment needed. I've also rented a warehouse and the office to work from. The problem lies in the registration process, where I hit a bit of a wall. They keep denying my papers and I have no clue what to do about it.

To be honest, you should've thought about this earlier. In order for you to fix this situation without risking your business, the best course of action is contacting Company Formations in UK and consulting them. They will analyze the situation and offer you the best deal to register your company in the shortest time possible.