The Crumpet Report Recipe (slight variation on Delia's):
225g plain flour
1/2 tsp salt
1 tbsp dried yeast
5g bicarbonate of soda
1 tsp sugar
275ml milk
55 - 75ml water
Method
Warmed the milk and mixed with sugar and yeast. Left to froth a bit. Sieved flour together with salt and bicarb.
Slowly mixed in milk mixture to form sticky batter. Added water until thick but not lumpy. Covered and left for...well, rather a long time, as I ended up having to go and pick up ds and do a bit of shopping. So let's call it 2 hours.
Came back to bowl practically overflowing with bubbly, yeasty froth
Heated lightly oiled frying pan and dropped about 1 large tbsp-ful of batter into well-oiled egg rings. Let cook and waited in anticipation for explosion of bubbles on top...and waited...and waited...
Promised bubbles did not appear, so was forced to flip over crumpet before getting burnt bottom [lewd-frankie-howerd-type ]
Worked way through all of batter (15 crumpets), but only about 2 had anything even remotely resembling holes on top
However, the taste was rather superb, being both fluffy and spongey, which is surely what you want in a crumpet.
Toasted this morning for breakfast, they were even better, as they got a lovely, slightly crisp outside, which constrasted beautifully with the aforementioned fluffy and spongey inside.
Conclusion
Not sure if it was the bicarb which made the difference ie no holes, or the leaving-too-long, so this wasn't really a very scientific experiment. It did convince me to keep trying, though, as they really did taste lovely; and the next batch is definitely going to be festive-shaped!