Drive where you want. There aren't any traffic wardens so the only people with powers over traffic are the police. If a police person does stop you, apologise immediately and tell them you think you've made a wrong turn and how do you get back onto the main rd near the town hall and the car parks.
But I didn't tell you, right
1. Yes.
2. Yes to both.
You must turn left at the top of Soresby St back onto Saltergate.
You must turn right at the top of Glumangate back onto Saltergate.
3. You can if you are going to Marks and Sparks loading bay to pick up shopping(ask me about this later). Otherwise, no.
4. You can't drive onto Church Way from St Mary's Gate 10am-4pm. Neither can you drive onto Cavendish or Stephensons from Church Way, it's a bus lane. You cant turn onto Cav St or Steph Plc from the Donut direction. You can turn up Steph Plc towards the donut direction, but the only place you can get to is the Spire, or back down Cav St.
You haven't been able to drive down Elder Way for the last 20 or more years as far as I know unless you're a lorry/delivery, taxi, or disabled. You must then turn left and back down Cav St or Steph Plc.
On a lighter note, taxis can now use the bus lanes. It's a pleasure to turn right at Tapton up towards the crem. The look on everybodies faces as they turn down towards Sainsburys to do a turn around
Any more questions I am more than glad to answer if I can