Welcome and I hope the right car finds you. I too bought my 4/4 sport as a retirement present to myself after 36 years of teaching Deaf children - I think I deserved some fun and after 12 years have not regretted my choice.
I do not have a spare on the Mog - it comes with a can of hair gel. I do not trust that and for the past few years have put Autoseal in the Mog and the Fiesta tyres and renewed it at tyre change time. It is water based and stays inside the tyre and permanently seals a puncture on the tread area. I think with my MSCC discount it cost about £50 per car. Peace of mind, as I would not want to change a wheel at the side of a road with today`s traffic.
Think about joining MSCC before yo choose a car it may give insight into ownership & how we view various models.