The Lenovo G50-30 has an Intel Celeron processor family which is better than most medium processor core laptops that were launched around the same time as it. Most medium processor core laptops that have been around for a similar time to it have an Intel Core i5-5xxx processor family. The processor family of all medium processor core laptops that have been on the market for more than a year ranges from AMD E to Intel Core i7-3xxx.
It may also be worth considering one of the other laptops that have an Intel Celeron processor family currently available including cheaper notebook PCs such as the Asus X453MA (£169.99).
If the processor family of this portable PC is not good enough for you then you might also want to look at the DELL Inspiron 15 3542 (Intel Core i3-4xxx).