I've always found that any fish that have not seen boilies will always always go for sweetcorn. Ive no idea why this is but it always is an instant winner. I'd buy up the Nash boilies and fish a single boilie over the top of the corn and nuts. I've used this method on so many lakes and rivers to great effect.
Soak the boiles in the corn juice prior to fishing makes them an absolute delight for the carp, they love them.