Binary logistic regression in SPSS


Please can someone help me. I am conducting a binary logistic regression in SPSS. I have the dependent variable (with two possible values, i.e. 1 = participation and 0 = no participation), and a number of independent variables. I have run a simple binary logistic regression.

However, I now want to introduce a third variable into the model, which is a subset of the dependent variable (i.e. the condition in which they participated, 1 = UK, 2 = non-UK). This would enable me to see if any of the independent variables predicted participation in one of the two conditions (UK or non-UK), and would add greater detail to my analysis.

Is anyone aware of how I might be able to do this in SPSS?

I'd be very grateful for any help :)