Preheat the oven to 200C/180C Fan. Line a baking sheet with kitchen paper and set aside.
Pour the oil into a large roasting tin and pop in the oven for about 5 minutes - or until it is very hot.
Tip the sausages into the hot oil and spread in an even layer. Pop in the oven and roast for about 20-25 minutes - or until golden brown.
Using a slotted spoon, remove the sausages from the tin and place onto the baking sheet lined with kitchen paper.
Carefully discard any oil remaining in the tin.
In a small bowl, mix together the honey and mustard.
Return the sausages to the tin and pour over the honey-mustard mixture. Stir well until all of the sausages are evenly coated.
Return the sausages to the oven and roast for a further 5 minutes, shaking the tin halfway through.
Meanwhile mix together the mayonnaise and wholegrain or Dijon mustard, to taste, in a small bowl. Set aside.
Remove the honey mustard glazed sausages from the oven and tip onto a serving plate. Serve straight away with the mustard mayonnaise.
