score:4
There is no reason to apply for another visa. Standard visitor visa allows both business visitor and tourist activities. If your visa is no good for another visit there is no point issuing someone a multi entry visa.
Whether you are granted or refused entry is something specific to you and other examples on the internet donβt matter much as long as your intention is to stay within the allowed limits.
Generally for multi entry visas only the first visit needs to line up with the statements in your visa application. Any subsequent visits donβt need to have the exact same reasons. Donβt even have to call and ask the embassy for it.