The profile or portrait of the reigning monarch is on all regular issue stamps.
Britain has always had a portrait of the ruling monarch on their stamps. Canada pictured the ruling monarch on their definitive stamps, which pretty much means a living person has been on their stamps from the first issue with Queen Victoria.
The Government
When the Queen dies, the next reigning monarch will have their portrait on coins and stamps. In the case of Great Britain, that will likely be Prince Charles, once he becomes King.
There are several places that one can purchase Great Britain stamps with Canada. The best place to purchase stamps is at any official Canada post location.
No, they did not exist then. Great Britain introduced the first postage stamps in 1840.
Stamps did not exist in that year. They were introduced in 1840 in Great Britain.
There were no stamps in 1801. The first postage stamps were issued in Great Britain in 1840. It was several years after that that German issued postage stamps.
they bought documents with stamps on them
One can buy Great Britain stamps from Arthur Ryan & Co, Great Britain Stamps, Oxfam, and many other online or local stores. One can find help for stamp collecting at Stamphelp as well.
Most postage stamps have words on them. The name of the country of issue has to appear on the stamp, except for Great Britain.
For postal purposes Scotland is a part of Great Britain, as is England. There is no difference in the stamps.
It may be purchased online from StampsForSale which has many commemorative stamps. You may also shop at RoyalMail which has a variety of gifts and stamps.