Andy M Fishless Cycle

Hang in there, Andy - it's most definitely worth it. A tank of happy fish is a wonderful thing!

retested an hour after adding 0.5 ml and was 0.5 ppm so added another 0.5 ml.

Hope I did right

Phew!!  See what tomorrow brings

Your readings are showing your ammonia eaters are growing well. Now all you have to do is wait.......

Tested again after an hour, 0.5 ppm so added another 0.5 ml ammonia.  Seems to be taking  1ml now to get back up to 1ppm. When I started it was only taking 0.5ml

I will but i'm not the most patient person 

Ah, grasshopper, learn you will. 

A water change would probably help.

I've been reading comment on another forum by someone who reckons we're all doing it wrong. His opinion is that once the ammonia drops to zero we shouldn't add any more ammonia until nitrite also drops to zero  . He says that the ammonia eaters won't starve. I need to be convinced of that but maybe I should have said to stick to the 0.5ml you had been adding so there isn't as much nitrite made. It's getting the bacteria started that takes the time. Once you have enough to get rid of even just 0.5ppm it only takes a few days of increasing ammonia doses to grow more. Under optimum conditions the bacteria can double in number every 24 hours (though maybe not quite that fast in a typical tank). It's just so slow at the beginning because there are so very few of them escape being poisoned by the water company's chlorine. Doubling hardly any in 24 hours still leaves not very many at the end of a week.

I'd go back to adding the 0.5ml. Even if that doesn't give quite as many ppm at least it won't make as much nitrite. Once your nitrite starts falling then increase the amount of ammonia you add a small amount at a time. And yes, do a 50% water change.

The problem with nitrite is that every 1ppm ammonia is turned into 2.7ppm nitrite so it goes off the top of the chart pretty quickly. I was dosing 1ppm daily and doing a 95% water change every other day at this point in my cycle to try and keep the nitrite reading somewhere on the chart. Easy with just 25 litres though.

Yes it will. The nitrite eaters will multiply until there are enough of them to eat all the nitrite being made by the ammonia eaters. It's just that the nitrite eaters grow slower than the ammonia eaters, and they can't even start to grow until the ammonia eaters start making nitrite. The average you see quoted is that it takes twice as long for your nitrite level to fall as it did for your ammonia eaters.
You added some bottled bacteria. These often contain a viable supply of ammonia eaters but the nitrite eaters are often not viable. This makes the first stage go faster than if you didn't use it but the second stage isn't speeded up and it seems very slow as the first stage was speeded up.
Compare my cycle. It took 14 days for my ammonia reading to drop to zero. It took 22 days for my nitrite reading to drop to zero. (Not quite twice as long in my case). Your ammonia dropped faster than mine, probably because the bottled bacteria did have some ammonia eaters.