Which courses should i choose as my final 2?

That's up to you, and not a bunch of people on an internet form, dude.

1) The University of Manchester

2) Queen Mary's or Kent

Thanks, any reasons?

I'd agree with Manchester #1 only because I've heard bad things about QMUL and Kent. Also I think the employment prospects are better there too.

But this is my opinion and you should make your own decisions so go and visit all these campuses and pick whichever you feel the most comfortable at.

I've got offers from :
Queen Mary University of London Q50 (AAA)
Mathematics, Statistics and Financial Economics G

The University of Manchester M20 (AAB)
Economics and Finance

The University of Kent K24 (ABB/A in maths)
Financial Economics

City University London C60 (A in maths/futher/320 ucas points)
Mathematics with Finance & Economics (not Cass course but some modules are )

MY FIRM IS UCL but what should i choose as insurance???
Queen Mary University of London Q50 (AAA)
Mathematics, Statistics and Financial Economics G

The University of Manchester M20 (AAB)
Economics and Finance

The University of Kent K24 (ABB/A in maths)
Financial Economics

City University London C60 (A in maths/futher/320 ucas points)
Mathematics with Finance & Economics (not Cass course but some modules are )