You seem to have had a lot of splits
Going from two to thirty odd in eighteen months either needs a lot of splits or a lot of buying in/swarm collection! Finishing with nineteen, from two initially, over two seasons is a good expansion rate, considering the miserable season this last 'summer'. When Pete changes his queens (from his own selected stock), he should be in a good position to go bee farming.
Yes, rapid expansion.
First 2 hives April 2011, 6 by July by swarm control (or lack of) and 2 collected swarms. These 6 united down to 4 in August 2011.
Then in September 2011 I bought 6 hives and 3 nucs from a member on here who was selling on behalf of a friend. So I took 13 into winter 2011/2012.
Came out with 12 as one turned drone layer and was shook out.
So spring 2012 had 12, 8 earmarked for honey and 4 for splits / nucs.
Harvested from the 8 after unites following AS.
The other 4 became 8, then 12 as some not successful after 2nd split. Bought in 4 queens then as wanted to try some Buckfast from Ged Marshall.
Housed a couple of swarms and had one more go at splits as was learning the art (from the original 4) and had nothing to lose and experience and learning to gain.
August 2012 started uniting.
Bit of an ambitious 2nd year beekeeping but following my week with Chris B learning some commercial tips I learnt that I could try a few different things and keep my options open if they didnt work out.
In terms of forage for all these bees, my honey hives were at 3 out apiaries and my splits and nucs were all in my home apiary.
Year 3 wont be so ambitious but I have the taste for it now.
Oh as an aside my new hobby has cost me £5k upto now and my 2 year beekeeping anniversary is April 2013
Pete D