Automation strategy using a volume metric on a selection

[bests3lleruk]

Hi, I wonder if anyone can help. I would like to create a strategy that effectively monitors a dog race, watches the favourite, waits for the first £100+ volume to be matched on a specific price point then sets a stored value at that point, then if £100+ matches below that price point it changes the stored value to that price. Then basically at a specified time before the off it checks to see if the last traded price is a specific amount of ticks above that stored value and if true it fires a bet in. It's basically looking for favourites that have been matched way lower and then drifted due to gambles and such. How would I go about this? I have bet angel professional.

Many thanks for any help