there is some light jabbing towards joint degrees, but roughly speaking it will extend - Warwick is considered to have strong statistics and economics departments as well. Maths + Stats and MORSE would be desirable for those looking to go into quant, investment banking, consulting etc. In fact it seems virtually everyone on MORSE has similar aspirations and many are successful. Typically MORSE students don't take much maths though and your pure choices are mainly limited to fields useful in statistics like functional analysis, measure theory, etc., I think if you want to do a lot of maths Maths + Stats is the better call. Even Maths + Physics would get a lot of people going into the financial sector.
Not quant but many stats modules at Warwick carry actuarial exemptions if you perform well in them.