Don't you ideally want an oil burner for the combination of low BIK and mileage?
The hybrid's do give you a low BIK, but after 30 ish miles you are left with a 1.nothing petrol engine hauling a massive car around - that won't be fun at all.
The secret to low company costs is:
1) Good depreciation to keep lease costs down
2) Low CO2
3) Low list price (its the list you are taxed on, not the actual purchase price) which usually means trying to avoid "needing" optional extras.
Other than the obviously fantastic Golf GTD which you don't want...
Audi is a poor choice - same car, higher list price, less toys. Pointless. If its the sportback you are thinking gives you more baby space, get a GTD estate instead.
BMW can be cheap to lease, they do have some low CO2 oil burners, but not the powerful ones. By the time you get to the powerful ones that you need to haul the heavier car around, you might as well have a smaller petrol turbo.
Lexus, always hated them, bland Toyota barges for people in beige slacks.
Merc, again not my thing really. I've never played golf, well, apart from VW Golf. Have a nast rep for poor build quality.
Jag - heard nasty things about the latest designs. Poor build quality and nasty plastics.
Considered a Volvo at all? Might be a bit of a left field choice, but...