Use these at 5-20mls per 6 egg mix depending on concentration. Infact powdered liver is an excellent atractor in its own right but very expensive. Its best used at 1oz per pound of dry mix. Also have a look at some of the snacks that float as you can catch carp on the surface with these. Also dont forget to look out for all the various seeds and pulses that can be used while you are there.
Supermarkets are very underrated but contain loads of great carp baits and ingredients.
Toasted sesame oil is a great atractor put in at 15mls per 6 egg mix. Look in the spice section theres some great bits and pieces there. They normally sell bottles of flavor, use only small amounts 3-5 mls per 6 egg mix . When using flavors a certain amount of experimentation is needed to get the best result. Always start on the low side then increase the dosage a little bit every trip.