It doesn't mention golf specifically in that link, but it does say
People may exercise outside as many times each day as they wish. For example, this would include angling and tennis. You will still not be able to use areas like playgrounds, outdoor gyms or ticketed outdoor leisure venues, where there is a higher risk of close contact and touching surfaces. You can only exercise with up to one person from outside your household – this means you should not play team sports, except with members of your own household.
Wednesday 13 May, the government will also allow outdoor sports facilities – such as tennis and basketball courts, golf courses and bowling greens – to open, but you should only use these alone, with members of your household, or with one other person from outside your household, while keeping two metres apart at all times.