when I press shift to exit flight mode, I get this error:

Description: Ticking entity

java.lang.NoSuchFieldError: eyeHeight
 at uk.co.swdteam.common.entity.EntityTardis.func_70071_h_(EntityTardis.java:192)
 at net.minecraft.entity.Entity.func_70098_U(Entity.java:1645)
 at net.minecraft.entity.EntityLivingBase.func_70098_U(EntityLivingBase.java:1882)
 at net.minecraft.world.World.func_72866_a(World.java:1861)
 at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:732)
 at net.minecraft.world.World.func_72870_g(World.java:1835)
 at net.minecraft.world.World.func_72866_a(World.java:1924)
 at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:732)
 at net.minecraft.world.World.func_72870_g(World.java:1835)
 at net.minecraft.world.World.func_72939_s(World.java:1664)
 at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:571)
 at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:703)
 at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:598)
 at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:164)
 at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:478)
 at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
 at uk.co.swdteam.common.entity.EntityTardis.func_70071_h_(EntityTardis.java:192)
 at net.minecraft.entity.Entity.func_70098_U(Entity.java:1645)
 at net.minecraft.entity.EntityLivingBase.func_70098_U(EntityLivingBase.java:1882)
 at net.minecraft.world.World.func_72866_a(World.java:1861)
 at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:732)
 at net.minecraft.world.World.func_72870_g(World.java:1835)
 at net.minecraft.world.World.func_72866_a(World.java:1924)
 at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:732)
 at net.minecraft.world.World.func_72870_g(World.java:1835)

-- Entity being ticked --
Details:
 Entity Type: null (net.minecraft.entity.player.EntityPlayerMP)
 Entity ID: 232
 Entity Name: saruman5679
 Entity's Exact location: 23.89, 64.00, 300.01
 Entity's Block location: 23.00,64.00,300.00 - World: (23,64,300), Chunk: (at 7,4,12 in 1,18; contains blocks 16,0,288 to 31,255,303), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
 Entity's Momentum: 0.00, -0.08, 0.00
 Entity's Rider: EntityTardis['entity.thedalekmod.DMTardis.name'/77, l='New World', x=23.89, y=65.35, z=300.01]
 Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
 at net.minecraft.world.World.func_72939_s(World.java:1664)
 at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:571)

-- Affected level --
Details:
 Level name: New World
 All players: 1 total; [EntityPlayerMP['saruman5679'/232, l='New World', x=23.89, y=64.00, z=300.01]]
 Chunk stats: ServerChunkCache: 629 Drop: 0
 Level seed: -4181708232867021003
 Level generator: ID 00 - default, ver 1. Features enabled: true
 Level generator options:
 Level spawn location: 60.00,64.00,240.00 - World: (60,64,240), Chunk: (at 12,4,0 in 3,15; contains blocks 48,0,240 to 63,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
 Level time: 6340 game time, 6340 day time
 Level dimension: 0
 Level storage version: 0x04ABD - Anvil
 Level weather: Rain time: 93518 (now: false), thunder time: 100474 (now: false)
 Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
 at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:703)
 at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:598)
 at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:164)
 at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:478)
 at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
 Minecraft Version: 1.8
 Operating System: Windows 10 (amd64) version 10.0
 Java Version: 1.8.0_25, Oracle Corporation
 Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
 Memory: 297293080 bytes (283 MB) / 620265472 bytes (591 MB) up to 1060372480 bytes (1011 MB)
 JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
 IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
 FML: MCP v9.10 FML v8.0.26.1299 Minecraft Forge 11.14.0.1299 4 mods loaded, 4 mods active
 mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
 FML{8.0.26.1299} [Forge Mod Loader] (forge-1.8-11.14.0.1299.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
 Forge{11.14.0.1299} [Minecraft Forge] (forge-1.8-11.14.0.1299.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
 thedalekmod{Update 42.1 Patch} [thedalekmod] (Dalek Mod - Update 42.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
 Profiler Position: N/A (disabled)
 Player Count: 1 / 8; [EntityPlayerMP['saruman5679'/232, l='New World', x=23.89, y=64.00, z=300.01]]
 Type: Integrated Server (map_client.txt)
 Is Modded: Definitely; Client brand changed to 'fml,forge'

Pls help, I really   want to fly my tardis!

p.s. yes this was in updates 41, 41.1 and 42 as well as 42.1

You need to update your version of forge, you are using a very old build.

This version should work.

http://files.minecraftforge.net/maven/net/minecraftforge/forge/1.8-11.14.4.1577/forge-1.8-11.14.4.1577-installer.jar

Oh my goodness it worked! thanks so much 1WTC!