Growmore would be fine, at 130g per square metre, covering the area under the tree to just beyond the spread of the branches. Ideally it should have been done about March, but doing it now certainly won't harm. Fork the food into the soil and then water it in well a couple of times.
I mentioned pollinators before, too - you will get more fruit from your pear if there is another pear nearby to act as a pollinator. That's why you got most pears in the first year, when it had been kept with other pears by the nursery.