To mark St George's Day, Mike whips up a delicious salad packed full of ingredients sourced from around the UK, including asparagus, mackerel, radishes and new potatoes. Mike isn't the world's biggest salad fanatic, but will this recipe convert him? And will salad queen Fleur be impressed?

INGREIDENTS:
500 g mini new potatoes
200 g fine asparagus
0.5 tbsp white wine vinegar
1 tbsp lemon juice
0.5 tsp Fairtrade caster sugar
3 tbsp sunflower oil
0.5 tsp mustard powder
1 large red onion, finely sliced
100 g cucumber, washed, halved and thinly sliced
100 g radishes, washed, trimmed and thinly sliced
2 tbsp washed and chopped fresh flat-leaf parsley
75 g watercress, washed
130 g smoked mackerel, skin removed, and flaked into pieces

METHOD:
1. Place the potatoes in a pan of cold water. Bring to the boil then simmer for 12-15 minutes, until tender. Drain and allow to cool. Meanwhile, place the asparagus in a pan of boiling water and simmer for 1½ minutes, then drain and refresh in cold water.

2. Put the white wine vinegar, lemon juice, caster sugar, oil and mustard powder in a jug. Season with freshly ground black pepper, whisk together, then set aside or store in an airtight container until required.

3. Transfer the potatoes and asparagus to a large bowl and add the onion, cucumber, radishes, parsley and waterc.