Just finished off a large tin of timber rot treatment which I probably bought ~20 years ago, which seems to work very well. It's for treatment of timber which in a modern house would have been pressure treated, but in an old property, wasn't treated. Claims to protect against and kill wet rot, dry rot, insects. It's a Wickes Professional product (oh the irony that range no longer exists;-)
Are such products still available anywhere, or have they all been banned now?