Hi there's no standard that would allow you to be able to guess. But on the info, I'd say that you are quite likely to be getting an offer - paricularly if your Tech interview was with someone that either is, or works directly for the hiring manager.

General approach here now for mid-senior UK expat level tech based roles is UK salary - tax free + housing + transport + relocation + medical + 1 x annual flight home for self & family. School fees are different for each company.

Good luck.