Just get the weight and cost from their scales, ask for stamps and post it in a pillar box yourself....problem solved.
"How much would it be to post this <Insert service)",
"It'll cost X"
"Can i have it in stamps/labels please"
"So i can post it at a later date"
never had any problems with this approach.
"How much would it be to post this <Insert service)",
"It'll cost X"
"Can i have it in stamps/labels please"
"So i can post it at a later date"
never had any problems with this approach.