Is Bsc business psychology a good degree? And would there be more workload since it combines two degrees?
Is Bsc business psychology a good degree? It's a degree. How do you define a "good" degree? It's a little presumptuous to assume that everybody would have the same criteria as you. Be clearer with your definitions and what you are looking for, and we might be able to help you more. If you are outside of the UK, do specify this as well. It's a little difficult to advise if you are using information specific for the UK in other countries.
And would there be more workload since it combines two degrees? No. A standard bachelor degree would contain a set number of units and a set workload. No more no less. A degree combining 2 or 3 subjects (i.e. those with "and" and "with" in their titles) would still have the same number of units and workload as any other bachelor's degree, but they would cover the core topics from all subjects leaving fewer electives in both subjects e.g. If a standard psychology degree and a standard business degree has 6 mandatory units each leaving 12 optional units in each degree, a combined or joint degree would have 12 mandatory units from both subjects leaving 6 optional units. The only situation where I could see you having more workload is if it's a degree with honours, which by definition has more Year 3 units to cover (typically a dissertation of some definition). Otherwise, all bachelor's degrees have the same workload.
Note: a business psychology degree is not a joint degree. If you look through the modules in the degree, it should specify it's a psychology degree in a business context. If the degree was in "business with psychology" or "business and psychology", then it would be a joint degree.