I'm not type 2, but I do a fair amount of exercise and at one time used to play very bad golf.
I think that the other replies aren't taking into account the energy expended in a average game of golf. As long as you are walking pulling a trolley (and not in a buggy) you could be using 1200-1400 calories for a round, more if you are carrying your bag as often the case in winter and actually I suspect many UK courses are more strenuous than this (calorie info is from US sources)
So a round of golf needs a fair amount of fuel.
You need a breakfast that doesn't cause a high spike (9 is a bit high but not in the stratospere!) but does give you enough energy to sustain you.
It may be a good idea to tweak your breakfast, porridge and honey is relatively low GI but it does depend on the portion size ,type of porridge and amount of honey.
Heres a few suggestions for tweaking: Use jumbo oats, perhaps cut the amount of oats by 10g, add some flaked almonds or chopped walnuts, instead of honey use a low gi fruit like a tablespoon of berries ( I put frozen berries on top and just 20 sec more in the microwave) or half an apple.
Otherwise you could use half the portion size of the porridge but have a slice of ham or an egg.. or either of these with one slice of grainy bread.
If you look on the internet you will find lots of suggestions for lower gi breakfasts. As with anything you do need to test how these foods work for you.
Eventually you may might need a 'top up'. Sugary water will give you a quick boost causing your levels to rise quickly and probably fall back to where they were before. It woud be better to start refueling before your glucose levels get too low and it might work out better if you do it gradually, eating a little every now and then after the first hour , hour and a half or so (depending on when you ate breakfast and how stenuous the first few holes are)
Again look for something lower gi... fruit, pieces of apple, orange, cherries; a few chopped dried apricots with seeds and nuts. A cereal bar or oatcake, just breaking off a bit every now and then (be really careful reading labels as cereal bars vary and some are very high sugar /carb). Again google for low gi snacks.
As ever whatever you do you need to test... my small and your small may be different and our bodies responce to foods also differs.