It is important to note that you must have at least 3 months validity on your passport – you can renew your passport online as per the following links. There is also very good information on the GOV UK website
For adult passport renewals please click here.
If you do not have time on your side and need to renew urgently please click here.
And for people with disabilities please use this link.
If you are in need of an emergency travel document please click here
For updated information regarding fees please click here