Hey Manaswini,
Europe's visa system is as complicated as any other country's with loads of tiers under every category.
There should be come category of visa which employs people with a specific skill set not found in UK e.g 'Tamilian/Keralite cook specialized in Indian food'.Hmm..even the home office will not disagree on allowing someone from India to fill this job opening
Though I agree how do domestic cooks cross the border ?