Advice please

Saw Dr on 4/7.

Thyroid results are:

TSH 0.08

Is it TU? Can't read his writing 19

Any advice about these results would be very welcome.

I currently take thyroxin at 125mg one day & 150mg the next. I alternate between the 2 doses.

I also asked him about T3 & he shut me down straight away saying this is not prescribed in the UK. Is this correct???

Thanks.