I cant remember which medical schools other than SGUL were in clearing last year, but I think Liverpool and Peninsular have been in the past. What happens more frequently is that Medical Schools will contact near misses in August or do it more formally by asking people if they want to be kept on a wait list. The latter happened to a couple of people on last year's thread, though only one posted, whilst another MN DC was offered a SGUL place.
The reality is that so many apply that a good proportion will not get places first time round, and applicants are sifted on a range of criteria. Very few will be good at everything. DD ended up getting quite bolshie, effectively declaring that she was who she was, she thought she would make a good doctor, if others disagreed, so be it. Her strengths ironically were strong A level predictions - the same went for her two friends who received no offers - and lots of EC, volunteering and shadowing. But a poor UKCAT, less than perfect GCSEs and no BMAT as she had been very ill during the summer and recovery took precedence.
The focus became planning the gap year with that year's applications being a trial run, to the extent that when she received an offer, she asked to defer as she wanted the gap year anyway. Starting a year later did her no harm. There are plenty of grad students who are quite a lot older, and life experience away from school/university will do her no harm. (Though working for a family ski company may have put her off Paeds for ever.)
So come back to the main thread. There will almost certainly be some panic around March, plus some useful information like Prof Layton's recent post. And certainly some of those who are jubilant about interviews, are doing so out of relief rather than bragging. The toughest thing for DD, was not just the other medic applicants at her school having places, but that by March all her friends had firmed their offers, and were focused on mocks and coursework, whilst she was in limbo.
I would recommend reading the tail end of The Students Room medic threads for the Universities your DC have applied to, for last year and the year before to give yourself reassurance that strange things do happen in August (sometimes the other way round, where applicants are paid to defer to help the University get their numbers right). When your DC ace their grades it might help them decide whether it is worth an opportunistic email.