Hi Tony,
I know of two men named Thomas Swarbrick who have connections with the Royal Scots. One of them has a service number: 350634 the other has a four digit number. I have quite a bit on both men, and I would be willing to pass on what I have once we can verify that we have the right man. As far as I am aware, and I have an extensive database of all known Swarbrick men who served, there are no other T. Swarbricks in the Royal Scots. [There was a J and an H Swarbrick who served.] Is there any possibility that you have misread the last three digits or the initial?
Regards,
jds1949