Thanks for the information which is most useful. My starter is firm, apparently what the French call a chef. Started it off on Tuesday with 100 grams each of flour and water and have carried on in the same vein (albeit with different flour). After the initial period of intense activity for a few hours from this time yesterday, it seems to have gone dormant. However when I went to feed it a short time ago, it had a slight aroma and was riddled with small holes.... N.B. Actually, after the first refreshment which was 100 grams of flour added to the starter in its entirety, I've been adding 45 grams of water and 90 grams of flour to 60 grams of the starter, discarding the rest.