Regatta Footwear size tables:

Men's / Women's Footwear
UK Size 3 4 5 6 6.5 7
Continental Size 36 37 38 39 40 41
 
UK Size 8 9 9.5 10 11 12
Continental Size 42 43 44 45 46 47

 

Kids Footwear
UK Sizes J8 J9 J10 J11 J12 J13
Continental Sizes 27 28 29 30 31 32
UK Sizes 1 2 2.5 3 4 5 6
Continental Sizes 33 34 35 36 37 38 39