I have an idea!

As I had a bad chilli year, last year. Mainly because of voles. I was thinking I’d put my chilli pot on top of upside down pots. To make things more difficult for the voles to get to the plants. I was thinking a more narrow pot than the chillies are in. Which would create an over hang to make things very difficult. 
Would it work? Has anyone tried it or something similar?

I can't give you a definite answer to that Sc but think it would work but you won't know till you try

Just lock a cat in your greenhouse.

Or get a Husky, mine eats voles without them even touching the sides.

Do they tunnel under the plants or scuttle up them?

Just lock a cat in your greenhouse.

Or get a Husky, mine eats voles without them even touching the sides.

The Labrador is a vole catcher and eater. However there wouldn’t be much left of my chillies, with his thuggish hunting style.

Do they tunnel under the plants or scuttle up them?

Definitely up not under. The plants themselves are not touched at all. The ripening chillies are left half eaten all over the place. Some still on the plant.

How about setting traps baited with chillies, if the voles have a taste for them.  If the voles can scramble up the smooth sided pots, they might just climb up two pots unless you put, say, an upturned large saucer with a lip inbetween the two pots to make a barrier.
Apologies for the drawing,
   

How about setting traps baited with chillies, if the voles have a taste for them.  If the voles can scramble up the smooth sided pots, they might just climb up two pots unless you put, say, an upturned large saucer with a lip inbetween the two pots to make a barrier.
Apologies for the drawing,

Tony Hart's got nothing on you Jen

How about setting traps baited with chillies, if the voles have a taste for them.  If the voles can scramble up the smooth sided pots, they might just climb up two pots unless you put, say, an upturned large saucer with a lip inbetween the two pots to make a barrier.
Apologies for the drawing,

Tony Hart's got nothing on you Jen

I had to figure out how to draw with my finger on my tablet, then get it onto a picture to enable to post it .  We got there in the end.  Finger  painting next

How about setting traps baited with chillies, if the voles have a taste for them.  If the voles can scramble up the smooth sided pots, they might just climb up two pots unless you put, say, an upturned large saucer with a lip inbetween the two pots to make a barrier.
Apologies for the drawing,

Drawing is exactly the sort of thing I want to do. 
I don’t use traps in the tunnels. What ever tiny gap voles can get through to find the trap, so can the little wren. Who is always in the tunnels.