I just posted the first of my optical centre punches out. In this case just the body and optic. Thinking it only weighs about 30gm packaged just had loose change when I walked to the Post Office. Stuck it on the scales and asked for 2nd class (I'm in Yorkshire, we don't do First unless it's pre-paid) Then it got the Joke slot test.... Your package won't fit the slot so it's a small package and thats £2.85 !!! WTF To be honest she was really kind and told me I could pop back later with the 15p I was short by

I think she was more embarrassed than me.

Once home I bagged up another couple and measured them. One on the left 75p, one on the right £2.85. I even said I thought I could repackage it, but no sellotape to be seen and other potential victims inline I took up her kind offer.
Now looking on the Mail website I could have boxed 80+ of these and sent them for the same price as they do a great deal, 2kg sent for the same price as 1kg. Oh DHL were 10p cheaper, but not within walking distance.
That grumpy guy Up North