In general, no, but check the walk description as sometimes the walk leader will ask you to contact them prior to the walk.
That said, if you do let the walk leader know you are coming, they are more likely to wait for you if you are running late for some reason.
There are no hard and fast rules on how long a walk leader will wait for you if you are late, and it is strongly recommended that you try to be at the start point prior to the walk start time. However being late is sometimes unavoidable and most walk leaders will try to delay starting if they know that you are coming.
Some things to bear in mind:
- It is unfortunately the case that people often let walk leaders know they are coming several days in advance and then fail to turn up. As a result, some of our walk leaders will assume you are not coming if you are not there on time and have not told them you are coming on the day.
- Mobile phone signals are often poor at walk start points - especially in mountainous areas. It is safer to let the walk leader know you are coming when you set off than when you realise you are likely to be late.