diff --git a/part14-ethernet/kernel/kernel.c b/part14-ethernet/kernel/kernel.c
index 800add3..fb69c21 100644
--- a/part14-ethernet/kernel/kernel.c
+++ b/part14-ethernet/kernel/kernel.c
@@ -2,7 +2,6 @@
 #include "../include/io.h"
 #include "../include/spi.h"
 #include "../include/multicore.h"
-#include "../net/enc28j60.h"
 #include "kernel.h"
 
 void initProgress(void)
diff --git a/part15-tcpip/kernel/arp.c b/part15-tcpip/kernel/arp.c
index c6b1c5c..98c084f 100644
--- a/part15-tcpip/kernel/arp.c
+++ b/part15-tcpip/kernel/arp.c
@@ -4,58 +4,13 @@
 
 ENC_HandleTypeDef handle;
 
-// Structure for Ethernet header
-
-typedef struct {
-   uint8_t DestAddrs[6];
-   uint8_t SrcAddrs[6];
-   uint16_t type;
-} EtherNetII;
-
-// Ethernet packet types
-
-#define ARPPACKET 0x0608
-#define IPPACKET  0x0008
-
-// Structure for an ARP Packet
-
-typedef struct {
-   EtherNetII eth;
-   uint16_t hardware;
-   uint16_t protocol;
-   uint8_t hardwareSize;
-   uint8_t protocolSize;
-   uint16_t opCode;
-   uint8_t senderMAC[6];
-   uint8_t senderIP[4];
-   uint8_t targetMAC[6];
-   uint8_t targetIP[4];
-} ARP;
-
-// ARP OpCodes
-
-#define ARPREPLY   0x0200
-#define ARPREQUEST 0x0100
-
-// ARP hardware types
-
-#define ETHERNET   0x0100
-
 // MAC address to be assigned to the ENC28J60
 
-uint8_t myMAC[6] = { 0xc0, 0xff, 0xee, 0xc0, 0xff, 0xee };
-
-// Router MAC is not known to start with, and requires an ARP reply to find out
-
-uint8_t routerMAC[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+unsigned char myMAC[6] = { 0xc0, 0xff, 0xee, 0xc0, 0xff, 0xee };
 
 // IP address to be assigned to the ENC28J60
 
-uint8_t deviceIP[4] = { 192, 168, 0, 66 };
-
-// IP Address of the router, whose hardware address we will find using the ARP request
-
-uint8_t routerIP[4] = { 192, 168, 0, 1 };
+unsigned char deviceIP[4] = { 192, 168, 0, 66 };
 
 // HELPER FUNCTIONS
 
@@ -90,60 +45,16 @@ uint8_t memcmp(void *str1, void *str2, unsigned count)
     return 0;
 }
 
-// MAIN FUNCTIONS
-
-void SendArpPacket(uint8_t *targetIP, uint8_t *deviceMAC)
-{
-   /* Parameters:
-    *   targetIP - The target IP Address for the ARP request (the one whose hardware
-    *              address we want)
-    *   deviceMAC - The MAC address of the ENC28J60, i.e. the source MAC for the ARP
-    *               request
-   */
-
-   ARP arpPacket;
-
-   // The source of the packet will be the ENC28J60 MAC address
-   memcpy(arpPacket.eth.SrcAddrs, deviceMAC, 6);
-    
-   // The destination is broadcast - a MAC address of FF:FF:FF:FF:FF:FF */
-   memset(arpPacket.eth.DestAddrs, 0xFF, 6);
-    
-   arpPacket.eth.type = ARPPACKET;
-   arpPacket.hardware = ETHERNET;
-    
-   // We want an IP address resolved
-
-   arpPacket.protocol = IPPACKET;
-   arpPacket.hardwareSize = 0x06; // sizeof(deviceMAC);
-   arpPacket.protocolSize = 0x04; // sizeof(deviceIP);
-   arpPacket.opCode = ARPREQUEST;
-  
-   // Target MAC is set to 0 as it is unknown
-   memset(arpPacket.targetMAC, 0, 6);
-    
-   // Sender MAC is the ENC28J60's MAC address
-   memcpy(arpPacket.senderMAC, deviceMAC, 6);
-    
-   // The target IP is the IP address we want resolved
-   memcpy(arpPacket.targetIP, targetIP, 4);
-  
-   // Check if the last reply has come from an IP address that we want i.e. someone else is already using it
-   if (!memcmp(targetIP, deviceIP, 4)) {
-      // Yes, someone is using our IP so set the sender IP to 0.0.0.0
-      memset(arpPacket.senderIP, 0, 4);
-   } else {
-      // No, nobody is using our IP so we can use it confidently
-      memcpy(arpPacket.senderIP, deviceIP, 4);
+void enc28j60PacketSend(unsigned short buflen, void *buffer) {
+   if (ENC_RestoreTXBuffer(&handle, buflen) == 0) {
+      ENC_WriteBuffer((unsigned char *) buffer, buflen);
+      handle.transmitLength = buflen;
+      ENC_Transmit(&handle);
    }
-
-   // Send the packet
-
-   debugstr("Sending ARP request.");
-   debugcrlf();
-   enc28j60PacketSend(sizeof(ARP), &arpPacket);
 }
 
+// MAIN FUNCTIONS
+
 void net_test(void)
 {
    while (1) {
@@ -155,14 +66,6 @@ void net_test(void)
    }
 }
 
-void enc28j60PacketSend(unsigned short buflen, void *buffer) {
-   if (ENC_RestoreTXBuffer(&handle, buflen) == 0) {
-      ENC_WriteBuffer((unsigned char *) buffer, buflen);
-      handle.transmitLength = buflen;
-      ENC_Transmit(&handle);
-   }
-}
-
 void init_network(void)
 {
    handle.Init.DuplexMode = ETH_MODE_HALFDUPLEX;
@@ -189,11 +92,11 @@ void init_network(void)
    debugstr("done.");
    debugcrlf();
 
+   // Re-enable global interrupts
+   ENC_EnableInterrupts(EIE_INTIE);
+
    debugstr("Initialising the TCP stack... ");
    init_udp_or_www_server(myMAC, deviceIP);
    debugstr("done.");
    debugcrlf();
-
-   // Re-enable global interrupts
-   ENC_EnableInterrupts(EIE_INTIE);
 }
diff --git a/part15-tcpip/kernel/kernel.c b/part15-tcpip/kernel/kernel.c
index 6801d19..85c0edc 100644
--- a/part15-tcpip/kernel/kernel.c
+++ b/part15-tcpip/kernel/kernel.c
@@ -2,7 +2,6 @@
 #include "../include/io.h"
 #include "../include/spi.h"
 #include "../include/multicore.h"
-#include "../net/enc28j60.h"
 #include "kernel.h"
 
 void initProgress(void)