I've been there many times including a very dull psf v Brighton ,where the famous Doc T took us to the worse Pub i've ever set foot in . Next to Pokesdown Station ,I do hope that shithole was bulldozed .
Plenty in the Town centre just be sensible with colours. Last time i went had a great day except having punches thrown at me by a Brighton hoolie [mistaken identity].
Have looked for you mate and found this route Depart Soton 0830 Arr Woking 0919 Dep 0925 Arr Guildford 0933 Dep 1010[ Spoons 5 mins down the road] Arr Gatwick 1050 Dep 1105 into Brighton 1139 . All trains running.