How Fool-Proof is this Perfect Beef Wellington?

I try the amazing 'Andy Cooks' recipe for Beef Wellington. THis was the 1st time I've ever made this iconic british dish.
Find his full recipe here:
• This Is How You Cook T...
Recipe
Ingredients
- 1.2kg Beef fillet, centre cut
- Dijon mustard
- 100g prosciutto
- 350g puff pasty
- 2 eggs for egg wash
- Mushroom duxelle
- 2 crepes
Mushroom duxelle
- 600g mushrooms
- 60g butter
- 4 shallots (1 brown onion if you can't find shallots)
- 6-8 thyme sprigs
- 50ml whiskey
- 30ml olive oil
- Salt and pepper to taste
Crepes
- 50g flower
- 130ml milk
- 1 egg
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