Thank you @Looper and @Benjamin for phrasing my disaster day so positively And thank you to you both and @DP1011 for your fast and efficient rescues.
@Looper kindly offered to let me try my hand one more time, but from experience I know that pop outs are a plague for me- where there's one, there's more! Plus the butterfly effect as Looper pointed out. I didn't want to keep delaying what was supposed to be Faqaa *Express*, so I'm off to have those tyres refitted and that valve replaced and try again another day.
Thanks to all for their patience!