We have a fellow Daily Punt reader to thank for today's micro system.
Derek posted the following micro system in the comments yesterday.
Here's what Derek said…
I use a micro system for Henderson and it’s based on debutants having first run under UK rules. It is based mainly on NH flat and hurdles. I know you use horseracebase so I’ve just cut and pasted my rules.
Here are the rules in plain English as opposed to HRBish!
Henderson Debutants System
National Hunt races.
Run at one of these courses: Ascot, Cheltenham, Chepstow, Doncaster, Exeter, Ffos Las, Fontwell, Kempton, Newbury, Sandown, Stratford, Towcester, Uttoxeter, Wincanton
Race Distance is 2m6f or less
Horse is have it's first run and is trained by Nicky Henderson.
It's price is between Evens and 16/1.
It is 6 years old or younger.
And we only bet in the main season between October to March inclusive.
Heres the overall performance since 2003.
And here's the breakdown by year
Back to Derek…
You will see that it has performed steadily year after year since 2003.
Henderson repeats the same training routine year after year and this has allowed me to have the above and two other micro systems (handicap hurdles and mares) on the man from severn barrows.
Regards
Derek
Excellent, thanks Derek 
Today's Selection
2.10 Chepstow Jumps Road – win bet – 5/1 Bet 365