The tariffs in Belgium work like this:
There are two formats of letters, "normal" and "outsize" (for want of a better translation). "Normal" letters are:
* Rectangular
* Maximum weight: 50 g
* Minimum size: 90 mm x 140 mm
* Maximum size: 125 mm x 235 mm
* Maximum thickness: 5 mm
There are two categories of service, "Prior" (next day delivery) and "Non-Prior" (next day but one delivery).
The costs (to an address in Belgium) are:
"Normal": �0.52 (Prior); �0.46 (Non-Prior)
"Outsize": �0.83 (Prior); �0.78 (Non-Prior)
In reality, of course, the "normal" envelopes you buy meet the above requirements.
At an exchange rate of �1.00 = �1.47, how does that compare with UK rates? Belgium, of course, is much smaller than the UK.