| 8 Products | May 2023 | May 2024 | Change |
| John West Mackerel Fillets in Sunflower Oil (115g) | £1.51 | £1.59 | + £0.08 5.3% increase |
| | £1.19 | £1.50 | + £0.31 26.1% increase |
| | £1.45 | £1.50 | + £0.05 13.6% increase |
| | £1.65 | £1.95 | + £0.30 15.4% increase |
| | £1.44 | £1.19 | - £0.25 7.7% decrease |
| | £1.80 | £1.80 | £0.00 5.3% increase |
| John West Mackerel Fillets in Olive Oil (115g) | £1.51 | £1.59 | + £0.08 5.3% increase |
| | £1.19 | £1.50 | + £0.31 26.1% increase |
| | £1.45 | £1.50 | + £0.05 13.6% increase |
| | £1.65 | £1.95 | + £0.30 15.4% increase |
| | £1.44 | £1.18 | - £0.26 7% decrease |
| | £1.80 | £1.80 | £0.00 5.3% increase |
| John West Mackerel Fillets in Sweet Chilli (115g) | £1.52 | £1.69 | + £0.17 11.2% increase |
| | £1.19 | £1.50 | + £0.31 26.1% increase |
| | £1.45 | £1.50 | + £0.05 13.6% increase |
| | £1.65 | £1.95 | + £0.30 15.4% increase |
| | £1.80 | £1.80 | £0.00 11.2% increase |
| John West Mackerel Fillets in Tomato Sauce (115g) | £1.47 | £1.50 | + £0.03 2% increase |
| | £1.19 | £1.50 | + £0.31 26.1% increase |
| | £1.45 | £1.50 | + £0.05 13.6% increase |
| | £1.44 | £1.19 | - £0.25 2.9% decrease |
| | £1.80 | £1.80 | £0.00 2% increase |
| John West Mackerel Fillets in Spicy Tomato & Chilli Sauce (115g) | £1.52 | £1.69 | + £0.17 11.2% increase |
| | £1.19 | £1.50 | + £0.31 26.1% increase |
| | £1.45 | £1.50 | + £0.05 13.6% increase |
| | £1.65 | £1.95 | + £0.30 15.4% increase |
| | £1.80 | £1.80 | £0.00 11.2% increase |
| John West King Oscar Mackerel Fillets in Olive Oil (115g) | £2.00 | £1.75 | - £0.25 -12.5% decrease |
| | £2.00 | £2.00 | £0.00 No change |
| | £2.00 | £1.25 | - £0.75 -18.5% decrease |
| | £2.00 | £2.00 | £0.00 -12.5% increase |
| John West King Oscar Mackerel Fillets in Lemon Oil Drained (115g) | £1.83 | £1.83 | £0.00 No change |
| | £1.50 | £1.50 | £0.00 No change |
| | £2.00 | £2.00 | £0.00 No change |
| | £2.00 | £2.00 | £0.00 No change |
| John West Mackerel Fillets in Tomato Sauce (125g) | £10.00 | £10.00 | £0.00 No change |
| | £1.50 | £1.50 | £0.00 No change |
| | £18.49 | £18.49 | £0.00 No change |
