Basildon Bond is the classic British writing paper, with the distinctive watermark. Those of us old enough to remember when letter-writing was a common way to communicate probably also remember holding the letter up to the light to see that the writer had used the 'fancy' paper for you. It's top quality smooth paper, and especially now that writing letters is a less common occurrence, why not make it a bit nicer to do, and add that bit of nostalgic luxury for the recipient?
50 sheets of white A4 writing paper, with guide sheet.