The National Curriculum says
Physical education–key stages 1 and 2
Subject content
Key stage 1
Pupils should develop
fundamental movement skills, become increasingly competent and
confident and access a broad range of opportunities to extend their agility, balance and coordination, individually and with others. They should be able to engage in competitive (both against self and against others) and co-operative physical activities, in a range of increasingly challenging situations.
Pupils should be taught to:
master basic movements including running, jumping, throwing and
catching, as well as developing balance, agility and co-ordination, and begin to apply these in a range ofactivities
participate in team games, developing simple tactics for attacking and defending
perform dances using simple movement patterns.
Key stage 2
Pupils should continue to apply and develop a broader range of skills, learning how to use them in different ways and to link them to make actions and sequences of movement.
They should enjoy communicating, collaborating and competing with each other. They should develop an understanding of how to improve in different
physical activities and sports and learn how to evaluate and recognise their own success.
Pupils should be taught to:
use running, jumping, throwing and catching in isolation and in combination
play competitive games, modified where appropriate [for example, badminton, basketball, cricket, football, hockey, netball, rounders and tennis],
and apply basic principles suitable for attacking and defending
develop flexibility, strength, technique, control and balance [for example,
through athletics and gymnastics]
perform dances using a range of movement patterns
take part in outdoor and adventurous activity challenges both individually and within a team
compare their performances with previous ones and demonstrate improvement to achieve their personal best.
Swimming and water safety
All schools must provide swimming instruction either in key stage 1 or
key stage 2.
In particular, pupils should be taught to:
swim competently, confidently and proficiently over a distance of at least 25 metres
use a range of strokes effectively [for example, front crawl, backstroke and
breaststroke]
perform safe self-rescue in different water-based situations.
as you can see it doesn't specify how long should be spent on teaching any of the activities only what school be taught over the six years and what children should be able to do at the end of that time.
The key word as far as swimming lesson provision is concerned is must