You can use Special Delivery to send items up to a maximum weight of 10kg.

Maximum size: Total item size, which is calculated by adding length, width and height, cannot exceed 90cm. The longest side cannot be longer than 61cm and shorter sides cannot be longer than 46cm.
Width + Height + Length = max 90cm
Width 46cm
Height 46cm
Length 61cm

Maximum length for rolled items is 90cm and the length plus double the diameter must not exceed 104cm. i.e. length + (diameter x 2) = maximum 104cm.
Length 90cm max