Good to hear your husband is getting back to work. I just wrote a reply on this issue of returning to work and you may find it useful. I’m hoping you can find my comments from my username or here…
It doesn’t sound like an ill health retirement situation as he is well enough to start back at work. Otherwise employers opt hastily for a dismissal on capability grounds (which may be unlawful). I do not agree with previous advice to consider this unless you have sought and considered full legal advice. I’m not sure that a TIA would qualify as a ‘disability’ in terms of employment rights but his employer certainly has a duty of care and should heed any warnings about things that have caused work related stress and reign those back.
If he can do management / administrative work, change of duties or job share with a colleague, work remotely or aim for 1 day in office when he feels more confident driving these are very sensible and practical adjustments. Be prepared to think about what the work could look like as this should help his mgr and HR work out a Return to Work plan. If this is recorded in his Occ Health report all the better as employers typically carry out the Consultant’s recommendations.
I say all this hoping that his employer takes a proactive and supportive stance. You are right to treat it seriously and look for ways to make changes in work and lifestyle. Good luck!