Rench u seem like a pretty smart guy and u wont have much trouble getting into the double degree of ur choice...with a double degree u can use extra skills and put them in practice when u work, it opens a lot more oppurtunities...e.g com/llb, u can go into hte legal side of things (i.e become a barrister/solicitor), or u can go into Investment Banking (i.e mergers and acquisitions, takeovers etc)... antha example, Com/Sci...u can make ur sci include maths and statistics, and then pursue an actuarial career, or become a quant, i.e ur applying the skills u learn in sci (maths and stats) and apply it to financial situations...there is the option howeva, of doing a single degree honours...it depends on ur desired career
I get what slide rule means, the double doesnt seem to gel naturally, but in fact they do complement each other (e.g Actuarial+AppFin)...but things like Enginering/Commerce doubles seem to have less in common...it depends on teh double degrees that u want to do