My baby breastfeeding was affected by tongue tie. This was missed by after burth checks, but noticed in the breastfeeding group by a specialist. It is important to check (do not trust one specialist, ask for opinions from another), as if tongue tie, cut should be done till around 10 weeks old. Referral took us two weeks.
We visited the London School of Osteopathy in Benthal Green. The baby was 7 weeks old, they helped us with digestion/muscle tension. The price was 25£ per appointment, no rush during the appointment (changing room, time to feed baby in the room), two students present and watching with the supervisor who performed the procedure.