The black cabs are a safe and reliable option in Glasgow, however expect to pay a lot more for this service than private hire companies. The black cabs have a very useful telephone booking service where you only have to press one button to order your cab, and they will call you when it's on your way. Watch out at the weekends when it will cost you £4 just to step inside one of these cabs before you start your journey home. However you can fit 5 in one of these, so it works out cheaper if you share!
Southside Radio Cars (0141 883 3333) are probably the fastest and most reliable private hire company I know in Glasgow that you don't need to pay through the nose for. They operate mainly between the southside of the city and the centre of town, but you may get lucky and find one in your area if they have a drop of in the north of the city.
Expect long waits for taxies when the football is on and at christmas time!
Perhaps my impression of taxis has been influenced too much by the taxi service in the area I live. Here you seem lucky if you can get a word out of the driver and too often you have to know the way to where you are going in order to give them directions. Also the condition and age of some of the vehicles can be a bit of a concern. It was therefore with a little trepidation that we headed for the taxi rank after our arrival at Glasgow Airport. As we walked along the line of clean, almost new cars I had the feelings that the service was going to be better in Glasgow. Our first surprise was the Taxi Steward. This was a gentleman who showed us to our taxi, put our bags into the boot of the car and then opened the car doors for us. The cost of the taxi from the airport to the city centre was £16 (about 12 miles) which we were quite happy with. Also the driver made sure that we were dropped right at the door of the hotel and helped us out with our bags. We used taxis a couple more times whilst in Glasgow and on each occasion the drivers were very polite and helpful. The prices were also very cheap. On our return to the airport we were travelling in the middle of the rush hour and the taxi driver enquired what time our flight was as he could have tried an alternative route if we were in a rush. As we had plenty of time this was not a problem, but we thanked him for his concern. As there was also a fixed fee of £16 for the journey, It was good to know that money was not ticking away as we were stuck in a traffic jam. We found all the people in Glasgow very friendly and helpful, but the taxi drivers stood out above the others. A very pleasant surprise for us. Now do any of them want to move to Nottinghamshire?