That halfpenny sounds like it's fine or below. That penny is worth £5 in fine condition, it sounds pretty low grade again. Values: The 1918 is worth £3 in VF, the 1929 is worth £2 in VF, and the 1937 is worth £3 in UNC The 1920 won't be worth much, £2 in VF, and the 1928 is worth £2 in VF, £8 in EF, and £25 in UNC. You haven't given us grades for these though, so we can't value them properly. Hope this helps, William.