Jelly and Bean books use the Sassoon family of fonts. The Sassoon fonts were designed following research done with children to find out which fonts they found the easiest to read. They have been developed to simplify the link between reading and handwriting.
'c, a, d, o, g, q, e' all begin with an anticlockwise movement of the hand.
'm, n, h, b, p, r, k' all begin with a downward movement which is then retraced upward and followed by a clockwise movement. (This includes the 'loopy k' which some schools use for leading into joined up writing.)
't, l, u, i, j, y' all begin with a downward movement and a turn at the bottom of the stroke.
's, f' begin with an anticlockwise movement and are then followed by a clockwise movement.
'v, w, x, z' and the 'straight line k', all use straight lines only.
If children are taught these correct hand movements as they write, then they are less likely to mix up 'b', 'd' and 'p'.