Set the instant pot to saute and add the olive oil to the instant pot. Now brown the beef.
Remove the beef and add the onions. Fry for around 2 minutes and then add the garlic, thyme and bay leaf.
Add the carrots and celery and season to taste.
Add the Worcester sauce and stock. Put the beef back into the instant pot.
Add the potatoes, tinned tomatoes and tomato puree. stir everything together and push the meat and potatoes into the liquid.
Put the lid on the instant pot and set on high pressure for 40 minutes
Leave under pressure for another 10 minutes and then do a quick release.
Add the peas and stir together. Set the instant pot to saute.
Remove around 2 tbsp of liquid to a small bowl and add the cornstarch. Mix well together and then add back into the pot. Stir well and cook until the sauce thickens (around 4 minutes).
Serve and enjoy.