Smoked Haddock Rarebit

200g (7oz) naturally smoked haddock full fat milk (enough to cover the haddock)

25g (1oz) butter

25g (1oz) plain flour

1 tsp mustard powder or English mustard

2-3 dashes Tabasco sauce

100ml (3 ½ fl oz) Guinness

450g (1lb) aged Cheddar, grated

4-6 pieces of day-old bread to toast

To serve:

Worcestershire sauce