While I can’t help you with a new rod, I can point you in one of two directions. For £50 you should easily be able to buy a new middle section for your new rod. All decent tackle firms will supply spare sections, just ask the tackle shop where you brought it.
Also, given your location, you are close to two of the best shops in the country. Fisherman’s friend will be able to find you a rod within your budget, and I am sure fosters of birmingham will be able to do the same. Both, if you find the shop you brought the rod from unhelpful, try one of these two for a spare middle section.