#1485 is techically the New Year issue but no mention on the cover or 'snow' on the title as in years gone by. #1494 last old title logo. #1495 new title logo ans 4 extra pages of strips. #1499 Easter issue. No April Fool issue this year. #1500 is dated Apr 17th 1971.
#1536 Xmas issue. There is no Fireworks issue this year: the nearest number is #1529 dated 6th Nov 1971 but no mention of fireworks. Unusual!
While special issues like New Year, April Fool and Fireworks fetch a percentage more than a 'regular' issue, the Christmas issue always commands much more - twice and on occasion for high grade copies, three times the value of a 'regular' issue.
#1522/1523 is are gift issues - The Beano Buzzer and The Humming Birdie. They can easily fetch £25 on their own. Comic and gift in high grade can bring £50+.