I have had three punctures over 55,000 miles. None repairable. One Very Slow, One Slow, and one where I needed to use the original Mazda goop. Now have a can of Tyreweld - original mazda very expensive!
I have a tyre hero MX-5 parts 17inch wheel in the boot. Yes it’s restrictive but you get all all the gear from kneeling pad, 2 ton ratchet jack, pontcho and head tourch along with extending nut release bar.
I’ve got a boot rack and bag for going away on holidays etc, also carries toilet rolls when there is a panic 
Buy a 17" space saver wheel. It WILL fit into a mark 3 boot…mine does
end of problem
But I have heard that with a space saver on, drive your sweetie very gently bently
I hope everyone realises that tyre plugs are illegal in this country and have been for many years. They are available to purchase for off-road vehicles only. The only legal repair is to remove the tyre and vulcanise with a mushroom type plug.
Evidence to support that claim?
So you can put goo in for emergency use but not a plug ?
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A few years ago I got a puncture in the office car park and had the misfortune of not having my locking wheel nut adapter in the car. A RAC mechanic turned up and put a plug in the tyre while it was still on the car. No mention of legal issues.
I will admit it is a grey area. What is fact is that it does not comply with BSAU159 which deals specifically with tyre repairs.
Please see this link which gives a detailed description and photos:
So, IMHO, the only time it becomes illegal is when a tyre blows, causes an accident, and the repair is deemed to be the culprit.
I am in the trade and there is no local dealer/repair garage in my part of the world that would consider a “string” repair, and only stock the “mushroom” type plug. I have worked in the garden machinery industry and the string plug is perfectly acceptable (low speed, off-road use). I would never use a string plug for a performance tyre or for a tyre on a vehicle that does motorway speeds.
Ahhh, I do not disagree with you in any way shape or form regarding a “Professional Repair”.
However, as we are talking about “Emergency Get You Home Methods”, I carry the Stop and Go Tyre Plugger kits in both my cars.
This does use a mushroom type of plug and in conjunction with a sealant should do the job. 
I HAVE seen this used several times now and works very well on motorcycles as a get you home method.
Likewise, ride/drive relatively slowly (as if you have a space saver on) and no issues should be encountered.
Obviously when practicable, have the tyre professionally inspected and if suitable have it repaired.
Personally, I would have a new tyre fitted.
All the best. 
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A chap I know had a puncture which was too big for the tyre gloop stuff and the AA came out with a temporary spare wheel for him. Never knew they did that. Saw the wheel and was a standard thin temp steel wheel covered in AA logos.