Unfortunately the server has developed the 'iron shovel gzip' bug that plagues many Tekkit servers, what this means is that if you craft or pick up an iron shovel your player data will become corrupt, you will be instantly disconnected with a 'gzip' error and unable to reconnect.
Once you have this issue the only way for you to get back on the server is for your player data to be deleted, this means you will also loose any items in your inventory at the time.
If this happens to you and you are unable to get a message to an Admin or Moderator in game via another player then please e-mail us at admin@diggyminecraft.co.uk so we can get you back in the game asap.
There is currently no official or unofficial fix for this bug, plus the item cannot be removed from the game or banned in a way that prevents this issue as even attempting to craft an iron shovel causes the problem whether the crafting is completed successfully or not.
I will be investigating further and hopefully a fix or workaround will be found, until then please remember not to attempt to craft this item.