1. Approximately 18 months ago I received protected oral sex with a male condom from a transsexual afterwards I took the condom off and then washed my penis head. Is this any risk of Chlamydia, Ghonnorea or Tritch? Approximately 14 months ago I had urinalysis, just routine. It had microscopic heamaturia, but no signs of infection. (LET negative). I have done this again recently. same results.
LET negative means that you don't have any leukocyte esterase, or white blood cells, but a urinalysis won't find STIs. You can have a LET negative test and still have an STI.
However, it is highly unlikely that you'd get an STI from protected oral sex. Oral sex with a condom still leaves a slight risk for genital herpes type 1 if you don't already have oral hsv1 (think cold sores), and syphilis, but the risk is very low.
2. I have received hand jobs at a couple massage parlours, once from a transexual. The transexual placed their penis at the opening of my anus, but did not go inside; Their penis and scrotum briefly rubbed against mine otherwise generally just masturbated me. Am I at risk of Chlamydia, Ghonnorea or Tritch?
There is no risk from this. A brief touch won't transmit anything, and handjobs do not transmit STIs.
You keep mentioning "transsexuals". The correct term is transgender, and to clarify, they don't have any higher risk for STIs than anyone else. It does help to know that, though, because often, know what body parts partners have helps us assess risk, but I'm not sure if you think they have higher risk than cisgender people. I just want to clear that up for you, and anyone else who reads this.
Do I need an Sti Test?
I don't think you do. Oral sex is lower risk than vaginal or anal sex, and you used a condom. I wouldn't worry at all. It's been 18 months, and you'd most likely have symptoms by now if you had something.