Ours didn't go smoothly.
We viewed our house on May 21, 2016. We made an offer on May 23, and reached an agreement with the seller on May 25. No chain, pre-approved lending... So we notified our lender, they did their inspection and the mortgage was approved by June 10th. Enter seller's completely slow and incompetent solicitor. Our solicitor was great (and charged us very little for what she did for us... I think it was about £1200?). Seller's solicitor (through Purple Bricks) was terrible. We finally completed on October 21st (we met the seller at our house on the 22nd to collect the keys and take possession). So, from viewing to completion was five months... and that's with getting our mortgage fully approved within 3 weeks.