thank you for your question, Asferth. Invisalign costs vary around the UK significantly, one piece of advice is to ask your chosen dentist what is included. Make sure all appointments both before treatment and after treatment are included, including appointments after the estimated period. Also ask about retainers to ensure these are included.
Your typically find costs of Invisalign for a single arch are anywhere from £1500 up to £3000, depending upon the complexity of the case and the number of aligners you need.
Hope that helps