NEW DIY solution:
Due to EU legislation customers can continue to mix their own e-liquids WITH nicotine the following way.
You purchase 100 ml. pg/vg base with 0 mg nicotine, and at least 1 x 10 ml. pg/vg base with 18 mg. nicotine and the aromas/flavours you want to add.
For example if your desired result is a 10 ml with 6mg nicotine AND flavour the recipe is:
18 mg. Nicotine pg/vg base 3.3 ml 33.33 %
PG/VG base 0 mg. 5.6 ml 56.67 %
Aroma/Flavour (optional) 1 ml 10 %