Charlotte street car park

I'm staying in Bath next weekend for a couple days and my accommodation have suggested this car park for long stays. I've checked online and the pricing seems confusing to me, can you pay for parking multiple times a day or do I have to pay for day rates (2 days) if I want to come and go?

It looks like £48 for 2 days, but if I arrive at 3pm on day 1, can I pay for 5 hours (until 8pm) then overnight rates? Then day 2 i'll be out before 8am returning around 4pm and can I then do the same again? It seems it would save at least around £15 depending on what times I'd actually arrive if I don't pay outright for 2 days.