Sally, You might want to do a little more research before buying a Presto Pot for use in the UK. With the difference in current you will need a rather large transformer and probably a different plug. Even then I've heard of people having porblems with the pots working properly.
I've been making incense for several years and have NEVER had sticks or cones ready to burn in such a short period of time. Depending on conditions (temp, air flow etc.) sticks take about 2 weeks, cones take a bit longer.