If you are thinking of going to Scotland from London then I would suggest you travel by train. The train fare sysytem in Britain is very confusing but if you book your tickets quite a way in advance then you can get them comparatively cheaply. I use a site called www.trainline.com to book my train tickets and with that site you can pay for tickets and then pick them up at the station on the day of travel which I guess would be good for you. I just checked and currently you can get tickets 1st class for £53.00 each way (£106 total journey) or just £18.50 in standard class. Id recommend first class because its quite a long journey (about 4 1/2 hours I think).