Thanx Brent, arlington and Messenger.
As you say guys in the Form Guide it lists the trainers name, and the driver of last 5 starts but not even when you click on the horses name and go to its Racing Performance life history does it mention the trainer at any part of its career, and unless you are aussiebrenno astute form guide expert who seemingly knows which stable every horse in Australia is in week by week race by race, sometimes like Arlington said "if" i noticed, if i had time, if i wasn't rushing back to my room like i was last night while attending a conference in San Diego and not in my norm with Sky Racing on the TV and the iPad at hand sitting on my couch in Melbourne, sometimes i might miss something that at other times i may have worked out.
Case in point last night at Shepparton race 4 the $35 winner Sweetasay, i did notice David Miles was driving but somehow missed he was also now the Trainer and it was racing on Miles' home track. This horse has always shown ability and is well bred with a Tennotrump/Maori/Sundon family tree. If i had read a Trainer notification that said "new trainer d miles since 1/3/14" (for example) i would have said to myself, thats significant, i like the horse, has a good barrier, new trainer, there is a $1.20 D Aiken fav tho so at $4.80 a place i'm in for $50! or maybe even 40 a place and 10 a win cos trotters gallop and you just never know what can happen, they are less predictable than pacers, particularly if you do follow the trotters a lot like i do and can get a good feel for some good ones and bad ones who can tend to be erratic.
And as far as a stable change to be maybe not as important as eating up and training good/bad etc, we have trainers in the top 20 across each state and a plethora not in the top 50! So if a horse with some good potential goes from a NON top 50 stable to a top 10 stable, you better take notice cos a top 10 trainer doesn't usually take on "donkeys" that are gonna waste their time, they aren't in it for the hobby, they will mostly take on something they reckon they can improve and make a dollar on.
Hence as Brent and Messenger pointed out it would be a hell of a lot easier than going back to search thru results pages, cos its not even mentioned in the horses racing history where it would actually be clearly seen