Where can I buy narrow (5-6mm) staples in the UK?

I am looking for staples that I can buy either online or in the shops in the UK that are narrower than your average staple. I would also need the stapler or staple gun to use them.
Ideally they would be about 5-6mm across.
I have been searching online and calling a few stationers but the only narrow ones I have found are from a building supply shop and while these are about the right width they have really long legs which is no good, I want the legs to be roughly the same length as a normal staple but just have a narrower width ( i believe this is technically called the crown!) of the actual staple.
I have already tried all the obvious places like office supply stores (staples etc), stationers and some of the less obvious places like B&Q and ahrdware stores.

Hi
I have a three small staplers that came with packets.
I found these came in a set with other small stationary (cellotape, paper clips etc.)

I got around 60 staples with each one.

These sets are usually designed for children's presents usually pink for girls (don't blame me for the stereotype).

I would try Claire's accessories, accessorize (kids), new look and possibly wilkinson/the works for such sets. With the non-stationary type shops I listed first your best bet, in their gift sections for children/teens.

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