Thanks for your advice, I'll have a look at the kiwi point of view on this. I have always used virkon aquatic disinfectant (apparently most effective for killing invasive species) and then dried everything out after a trip. Really hot water is apparently best to soak everything in, from what I've read warm water and soap is not very effective.
I always make sure my boots, especially laces are dry, I was told tiny mud snails can hide there apparently. And I check reels too, just in case.
If you have a boat, always drain the bilge and motor too, and rinse and dry any exposed areas.
When I used to fish in Ireland, they were pretty strict and had a lot of signage about this, their basic advice being "clean drain and dry".