Essdee brand water-based printing inks in 30ml metal tins.
 
A large range of colours are available from this brand and they work beautifully on both lino and on gel plates. 
 
The colours dry fast (which is great if you plan to create multiple layered designs) and are very easy to clean up with just soap and water.
 
Comes in individual tins or as a set of 6 colours in a presentation tin 
 
3 colour range options:
 
Rainbow: Black White Red Blue Yellow Green
Sea: Blue Turquoise Prussian Blue White Silver Gold
Land: Brown Green Orange Red Yellow Prussian Blue