I think it would be a good idea for Toby to spend his own money on an ultrasound. It would give him an opportunity to see how HA can drain financial resources..
If he needs further tests he can transfer to the NHS list and if all is well then he will feel "safe"..until the next time.
Can you argue with an ultrasound? Undoubtedly with HA but maybe taking responsibility for the cost of the scan would give the result more credibility for him?