Well my 'experiment' seems to have bitten the dust
The kit should make 40 pints but I didn't realise that my demijohns (white tubs really) only held 10 litres, so I was quite unprepared whilst mixing, so had to pour some from one into the other to get them both evenly mixed. I filled the remainder of the water needed from a jet gun as it was taking ages measuring a 1 litre jug each time to pour in. This created a huge froth though I'm not too sure that it was that that had a detrimental effect.
Anyway, after I had pitched my yeast, the one tub gurgled away quite nicely for about two days and then stopped. The other, which was identical in ingredients did bugger all! Nada - nothing - nowt - zilch - zip! They've both been like this now for about 3-4 days. I did try some swirling and adding some yeast nutrient but I think I've got myself a dud batch. Humph.
I know there can a million and one things that could have ruined it but do you think it may have been the lemon that I put in? I only dripped about a quarter of a real lemon, if that, into the mix?