need your help Londoners!!

hello crossfire community

this journal is primarily directed towards people from the community living in london. people who are well acquinted with the capital may help as well.

here's the deal:

i'm visiting Londen with uni next month (february) for about a week. We're gonna visit some interesting companies such as SAATCHI , parisbas fortis & JP Morgan. this will happen in group. another important part of our stay is to organise a company visit on our own (in pairs). now i'm really running late with exams (still ongoing) and stuff so what i wanna ask is simple: can i have a maximum of companies NAMES so i can start sending emails or even some calls.
the companies we've tried so far all responded negatively.
if you're asking yourself what kind of company, well since we're visiting the companies stated above it can be somewhat in that domain. obviously not that big (keep it realistic). so the only thing i need is NAMES of companies since i don't know the city :)

thx in advance