Its a hard course and will give you little to help you become a pilot academically.
That aside it is a well respected course and you will enjoy Glasgow and uni life. Any engineering degree will train you in problem solving and give you a solid technical background. If engineering interests you go for it. If you are just doing it because you think it will help you become a pilot have another think because it is alot of very hard work if don't like the subject.
There is quite good argument that you can't train an engineer you can only provide an engineer that was born with it the tools to prove what they have a gut feel for anyway.
Nothing stopping you training for a PPL but personally your money would be better spent with some of the other clubs and societys which are there. Why you might ask? Basically so that your CV will have something different on it when it comes to applying for jobs. There are hundreds of pilots out there with virtually the same CV's. The ones that stand out are the ones that the person has gone done scuba diving or VSO or any other group activity. Not everything about going to uni is learning the degree subject there is another significant part of life studies Which for an engineer does include shagging social sciense students on a thursday night in the QM union (don't lower your self down to arts please) and the same with nurses in Clatty pats/sticky vickies if still open.