Peach Leaf Curl

I've had my dwarf bonfire peach tree three years, and although it blossomed beautifully this year and is growing small peaches, it has succumbed for the first time to leaf curl on all its leaves. Last year it had a hint, but I just picked out infected leaves by hand, and it was fine. This year, it's really badly affected (presumably thanks to this grotty weather).

As far as I can make out, Bordeaux mixture has been withdrawn from sale, and no longer licensed for use. Pretty much all internet advice I can find recommends this - so I'm looking for current advice taking this into account!

I've read about Trichoderma as a possible treatment, but can't find much information about how to apply this, or whether it's effective (and it isn't cheap). 

Is there anything I can do about it at this time of year, in any case?