Allotments 4 All

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So I sowed several type of brassicas in modules.  They germinated well and started to grow and then did not get much bigger. 
There was not much wrong with the compost the courgettes plants became huge.
In the end I planted out some very poor looking brassicas and once outside they have done well, just starting to crop the broccoli.
So what am I doing wrong.
For many years we have had a great guy at the local market.  His brassicas seedlings were amazing, so I have not bothered with my own.  He has now retired.
So what am I doing wrong?
I made a mistake and manage to plant some Dahlia seeds and cabbages in the same tray.  Dahlias great, cabbages stopped growing. 
I watered, I tried feeding.  I thought they might be too hot on the windowsill, so I put some out, but a deer ate them.
I really do need to get my act together on this before next year.  Bought seedlings at our local garden centre are very expensive, and they are not even in single modules. 
I sowed some cabbages direct, and covered with some blue netting,  someone stole it, and the pigeons attached the cabbages.  And there were two foot prints in my seed bed.

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After a couple of burglaries in recent months we realise we need to improve our security with securitiy lighting, CCTV and possibly alarms.  We are in a rural location and there is no electricity on site.  Any advice? Do you know any suppliers who deal with situations such as ours.