not sure,but it will be 1 of 2 ways,i would think
1-item £10 95% off you would pay 50p
2-item £10 75% off you would pay £2.50 an extra 20% off £2.50 is 50p
you would pay £2
these are the only ways,i can assume it would be.it's a great bargain you have there,either way!!!!
tracy