Over the next 2 nights frosts wont be a problem but they will return to the north of the UK on Thursday night and spread to most other parts on Friday and Saturday night. Frosts will be patchy, however if you see less then 4C on these forecast charts below for 9am Friday and 9am Saturday for your location, most likely you will have to de ice your car in the morning.
9am FRIDAY:
9AM Saturday:
Settled, mostly dry and fine weather is thankfully here to stay in the UK for quite some time, until at least the first few days of October. So you can count on this weekend for any plans albeit cloud amounts will have increased by then, loosing the crisp Autumn sunshine however.