UK Visa Question

I might be working at a London based PE fund this summer as an intern before I start my MBA. Anyone have experience with UK visas? I will eventually get a Tier 4, but it seems that I’m not allowed in the country until one month prior to the program starting date. As such, I’ll have about a 3month gap (the time I would be working). Seems a Tier 5 visa might be possible, but not sure whether that effects the Tier 4 visa.