She scores well at dressage, jumps big fences with ease when she doesn't blow her head off and is just brilliant.
Her muscles and fitness is perfect to carry herself as far as myself and others can see, she doesn't always work through from behind at the start but when warming up i obviously work on this and she then uses her back end and can carry herself beautifully. It's so nice to feel her light in my hands as i'm only little myself.
But then she spends most of her time what seems to be a habit to just lean on me. I try a good half halt and dont let her but then she stretches her neck out and ploughs when I get off the reins so some advice would be fab.

Her bits are the right size, I jump hack and school in a plastic happy mouth and I know this can encourage leaning but to prevent it we often swap her into a warm metal snaffle just to have more affect than put her old bit back in.

But any advice would be fab, thanks x

I was taught this method by a rider who took a TB to I1 dressage as his second career. It works well on sensitive horses that like to lean.

I call it a backward halfhalt. The leg and seat cues are the same as for any halfhalt, but the rein is different. Instead of taking for a moment on the outside rein, you give for a moment on the inside rein. This switches the pressure of the bit to the outside rein, but it doesn't change the connection with it. This isn't enough of a give to wag her head, just enough to shake her off the inside rein and keep the contact with the outside rein. It works a treat!

This if often better done with a metal bit as they tend to have faster action than the lighter weight happy mouth bits, but since one of my horses only will go in a happy mouth, I use it, and for him it is quite effective. I've even used this technique on the not so sensitive horses, and it works well for them. It is the only way I can half halt my very sensitive andalusian and TB and have them really engage and not start to just hover over the bit without being truly through from behind.

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Give it a try.

many horses develop the tendency to be heavy on a snaffle - I have a bit that I prefer using for regular work, then switch to a snaffle for showing. The bit is a flat [or slight curb] about 1" wide and fairly thin. It fits comfortably into any horse's mouth whether green or experienced. The attachment can be either similar to a snaffle, or a curb [dressage style usually has the snaffle look, but I've found they're far cheaper with a slight shank - curb style. both work equally well for the purpose]. This bit is fantastic at keeping a horse light on the bit and responsive - while being extremely mild. I've used it on experienced horses [who were regularly worked in a full-bridle - both curb & snaffle] and they lighten up tremendously and can then be returned to a snaffle for hunter/jumper.

best wishes