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You've received a multiple entry Standard Visitor Visa from the UK.
Regardless of the original reason for the visit, you can use it to enter the UK for any purpose permitted by this type of visa, including tourism, business, or transit. A more detailed list of these permitted activities is in Appendix 3 of the immigration rules for visitors, where attending an interview is explicitly listed.
You may enter as many times as you wish, but you must depart the UK on or before the expiry date of the visa.