See the pattern here
£15.90
- £8.29
- £6.99
- £7.00
- £7.50
£7.00
£11.50
£9.70 £11.50
£8.90
£7.80 £8.90
- £8.90
£10.20 £11.50
£8.10
£10.60
£9.20 £10.60
£11.40
£8.20 £9.50