If any part of your wheel is touching the yellow lines, or even if a part of your vehicle is not touch but overhanging yellow lines, then you can be issued with a ticket. Although there were no signs present, double yellow lines indicate that you cannot park at any time of day, and there does not need to be a sign to indicate this if there are double yellow lines. Single yellow lines indicate parking is permitted at certain times, and there will be signs present to indicate this. If you still feel it is worth appealing, you can read our guide to this process here - www.honestjohn.co.uk/advice/driving-advice/parking.../ but it may be a case of paying this one and putting it down to experience.