A gardener should be expected to provide all tools and to take away all cuttings or waste.
I rarely do hourly work.. I ind clients and set up monthly retainers. There will be a monthly fee and for this, I will provide ongoing services as well as anything the client may request that is within the retainers contract. For example.. painting a shed would not be in that retainer, but cutting back and even removing climbing ivy from the house would.
So.. it depends if you want an ongoign gardener, or just a gardener to come in once a week.
Either way, you will need to set up a small contract or arrangement. I can't imagine any gardener doing work by the hour because it's simply not practical.
As a gardener you want to get a customer that wants you regularly for example.. 3 hours a week or 3 hours a month something like that..
Then, depending on what arrangement you get, a price is easier to figure out.
If for example, you wanted me for an hour, I would not accept. I would ask you what job you wanted doing, then give you a set price regardless of how long it takes me.
So the answer is tilly.. Who knows ;)
£15-£40 a hour I'd say as anything lower (for a self employed solo man) is not logistical.