@AndBreathe Things have progressed, but slowly! I want to thank you for advice and prompting me to go further with this issue. I've been worried by a high pulse rate for a while now...along with the high BPs. So I spoke to the Geriatric Consultant and explained regarding the Liothyronine and lack of blood tests for T4 and T3. To my surprise he said I had had T4 tests last August when the Laboratory thought my TSH was too low. No one communicated that to me, nor do I know what the result of the T4 test was.
However, I did get the full spectrum of Thyroid tests done last week and the results came back as TSH=0.2 Free T4=12.6 T3 = 7, (Reference ranges: TSH: 0.27 - 4.2 mU/L, Free T4 12 - 22 pmol/L, Free T3: 3.1 - 6.8 pmol/L. ) T3 was over the reference range, so we are trying me on 50mg Thyroxine which I was on before and only 5mg Liothyronine - was on 10mg. Difficult because I have 20mg Liothyronine tablets which I have to cut into quarters. I am to have more tests in 3 months. I think things might be going in the right direction with BP and pulse rate as they have both dropped, but I am only a couple of days into the new regime so it's hard to say if it's just a blip.
Anyway, wanted to thank you for your prompting, it's been very helpful.