Thank you, people. The instructions for the CT came in the post at the 11th hour - no fluid to drink after all but a blood test was needed for kidneys.
My son is coming with me to the multidisciplinary panel ... a friend offered but I thought that it would be an educational experience for my son as well as family support for me. I remember finding it quite overwhelming before but you learn quite a lot and its reassuring that medical professionals work together in this manner. When I had ovarian cancer that didn't seem to happen and there was some conflict between different hospitals involved.

1996, ovarian cancer surgery + cisplatin and taxol.
September, 2007, SCC of left lateral tongue. Excision.
October, 2009 recurrence in scar tissue, T1NOMO. Free flap surgery from left wrist - neck dissection. 63 year old New Zealander. No chemo, no RT.
February, 2014. New primary in left buccal mucosa. Marginal mandibulectomy, neck dissection, right arm free forearm flap. T1N0M0 but third occurrence and some areas of concern: RT started 8 April and finished 19 May.