Some time spent in industry is a great way to get into consulting, but you might want to consider exactly which industry you choose to gain experience in.
The FMCG is a notoriously difficult sector in whcih to sell consultancy. If you really want to gain skills that you can transfer over (and eventual sell work to), you would be much better off gaining experience in one of the industries that traditionally buy a lot of consultancy.
If I were you, I would consider energy (particularly oil & gas), pharma, financial services, telecoms and maybe even public sector (but you'll need to be in central government and on the civil service fast track if you really want to move back into consulting).
I'm certain there are industries I've missed and others will point you in the right direction, but FMCG wouldn't be my first choice if I were looking to move into consultancy.