Just so you know, a puppy is never completely housetrained until they are 6 months old. For some breeds, even later. This means that though you may be making tremendous progress housetraining, there will be "mistakes". Sometimes for reasons you can't figure out! Don't fret about it. Stay focused on the progress you are making. Your confidence in the techniques you are using to house train your puppy will ensure your success.
Training clubs that run the Kennel Club Good Citizen Dog Scheme - the largest dog training programme in the UK are a sensible place to begin. Here you will learn about every aspect of dog ownership from the Puppy Foundation Courses through to Bronze, Silver and Gold award levels. Go to GCDS Training Clubs in your County to find one near to you or email the GCDS Team ([email protected]) or call 0207 518 1011.