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Edit 4 Swapped out the board & now nothing works again. Uploads look fine but no serial comms at all from the ESP8266.

#include <ESP8266WiFi.h>
#include <WebSocketsServer.h>

const char* ssid     = "SKYNET";
const char* password = "yourdogsfavouriteauntysmaidenname";


WebSocketsServer webSocket = WebSocketsServer(81);

void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t lenght) {
  
    //Serial.printf("[%u] get Message: %s\r\n", num, payload);
    
    switch(type) {
        case WStype_DISCONNECTED:      
            break;
            
        case WStype_CONNECTED:
            {
              IPAddress ip = webSocket.remoteIP(num);
              Serial.printf("[%u] Connected from %d.%d.%d.%d url: %s\r\n", num, ip[0], ip[1], ip[2], ip[3], payload);    
            }
            break;
        
        case WStype_TEXT:
            {
              String _payload = String((char *) &payload[0]);            
              Serial.print(_payload);          
            }  
            break;    
            
        case WStype_BIN:
            {
              hexdump(payload, lenght);
            }
            // echo data back to browser
            webSocket.sendBIN(num, payload, lenght);
            break;
  
    }
}

void setup() {
  
  // Set up serial comms
  Serial.begin(115200);
  
  // Set up WiFi
  WiFi.begin(ssid, password);
  while(WiFi.status() != WL_CONNECTED) {
     Serial.print(".");
     delay(200);
  }  
  Serial.println("");
  Serial.println("WiFi connected");  
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  
  delay(500);  

  // Set up web socket
  Serial.println("Start Websocket Server");
  webSocket.begin();
  webSocket.onEvent(webSocketEvent);
}

void loop() {
  webSocket.loop();
}

#include <ESP8266WiFi.h>
#include <WebSocketsServer.h>

const char* ssid     = "SKYNET";
const char* password = "yourdogsfavouriteauntysmaidenname";


WebSocketsServer webSocket = WebSocketsServer(81);

void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t lenght) {
  
    //Serial.printf("[%u] get Message: %s\r\n", num, payload);
    
    switch(type) {
        case WStype_DISCONNECTED:      
            break;
            
        case WStype_CONNECTED:
            {
              IPAddress ip = webSocket.remoteIP(num);
              Serial.printf("[%u] Connected from %d.%d.%d.%d url: %s\r\n", num, ip[0], ip[1], ip[2], ip[3], payload);    
            }
            break;
        
        case WStype_TEXT:
            {
              String _payload = String((char *) &payload[0]);            
              Serial.print(_payload);          
            }  
            break;    
            
        case WStype_BIN:
            {
              hexdump(payload, lenght);
            }
            // echo data back to browser
            webSocket.sendBIN(num, payload, lenght);
            break;
  
    }
}

void setup() {
  
  // Set up serial comms
  Serial.begin(115200);
  
  // Set up WiFi
  WiFi.begin(ssid, password);
  while(WiFi.status() != WL_CONNECTED) {
     Serial.print(".");
     delay(200);
  }  
  Serial.println("");
  Serial.println("WiFi connected");  
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  
  delay(500);  

  // Set up web socket
  Serial.println("Start Websocket Server");
  webSocket.begin();
  webSocket.onEvent(webSocketEvent);
}

void loop() {
  webSocket.loop();
}

// Input buffer from ESP8266
String temp;

void setup() {
  // Set up serial comms
  Serial.begin(115200);   // Debug to Serial Monitor
  Serial3.begin(115200);  // From ESP8266
}

void loop() {
  while (Serial3.available()) {
      Serial.println(".......");
      Serial.println("In from ESP8266");
      temp = Serial3.readString();
      Serial.println(temp);
      Serial.println(".......");
  }
}

// Input buffer from ESP8266
String temp;

void setup() {
  // Set up serial comms
  Serial.begin(115200);   // Debug to Serial Monitor
  Serial3.begin(115200);  // From ESP8266
}

void loop() {
  while (Serial3.available()) {
      Serial.println(".......");
      Serial.println("In from ESP8266");
      temp = Serial3.readString();
      Serial.println(temp);
      Serial.println(".......");
  }
}

.......
In from ESP8266
[WS-Server] Server Started.

.......
.......
In from ESP8266
pm open,type:2 0

.......

.......
In from ESP8266
[WS-Server] Server Started.

.......
.......
In from ESP8266
pm open,type:2 0

.......

Edit 3 I have to press the red reset button after flashing the ESP8266 & it works BUT as soon as I unplug & restart nothing again! The client connects, sends the same data but it doesnt get echoed back via the serial comms. The only way to get to work again is to reflash the ESP8266 and hit the reset button.