There is a really clear advice page on the VA website about luggage it might help to check that. I'm pretty sure it mentions skis but not so sure it mentions golf clubs.
You can transport golf clubs/equipment at no extra charge, as long as the bag weighs less than 23kg (see below):
Planning a golf trip with Virgin Atlantic? Well fly your golf equipment for no extra charge as long as it weighs in at 23kg or less, and you can bring it in addition to your free baggage allowance.
Heres what your golf equipment can include:
One bag (containing a maximum of 14 clubs).
A dozen balls
An umbrella
One pair of golf shoes.