The first month is pretty much assured.
>> Am I right in assuming I'd be unlikely to obtain an Employment Visa?
No, you may be able to get a visa and you may not be able to. It would all depend on you impressing the right investment bank to hire you and sponsor you for the visa. Throw a stone up in Central and it will land on an investment banker type.. there are a ton of them and one more will not make a difference.
