Q602: Is there a legal requirement to have a spare tyre and a jack in your car?
No, in fact many manufacturers now provide tyre sealant and an inflation kits instead. However, these are only intended as a short term temporary solution, you must get your tyre repaired or replaced as soon as possible.
Some manufacturers provide a space saver or temporary spare wheel – these will usually have a number of restrictions e.g. you can't exceed 50mph and/or you may only be able to use them on the front or rear of the vehicle. If you do have to fit a space saver bear in mind that your vehicle's handling will be very different and you should aim to get a proper wheel back on the vehicle as soon as possible.
If you have any doubts about the equipment your vehicle has to deal with a puncture, consult your vehicle's handbook or an approved dealer.