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For future reference, this script will do the job.

[code]#target photoshop  app.bringToFront(); 

main(); 

function main(){ 

if(!documents.length) return; 

//amend to suit 

var folderPath = Folder("/c/folderName"); 

if(!folderPath.exists) { 

    alert("Output folder does not exist!"); 

    return; 

    } 

//this should be the first part of the filename  

//I.E. if file name = Picture0001.tif it needs to be Picture 

//N.B. it must be the same case! 

var fileName  = "filename"; 

var fileType = "tif"; 

var fileList = new Array(); 

var newNumber=0; 

var saveFile=''; 

fileList = folderPath.getFiles((fileName + "*." + fileType)); 

fileList.sort().reverse(); 

if(fileList.length == 0){ 

saveFile=File(folderPath + "/" + fileName + "0001." +fileType); 

SaveTIFF(saveFile); 

}else{ 

newNumber  = Number(fileList[0].toString().replace(/\....$/,'').match(/\d+$/)) +1; 

saveFile=File(folderPath + "/" + fileName + zeroPad(newNumber, 4) + "." +fileType); 

SaveTIFF(saveFile); 

    } 

}; 

function zeroPad(n, s) {  

   n = n.toString();  

   while (n.length < s)  n = '0' + n;  

   return n;  

}; 

function SaveTIFF(saveFile){ 

tiffSaveOptions = new TiffSaveOptions();  

tiffSaveOptions.embedColorProfile = true;  

tiffSaveOptions.alphaChannels = true;  

tiffSaveOptions.layers = true; 

tiffSaveOptions.imageCompression = TIFFEncoding.TIFFLZW;  

activeDocument.saveAs(saveFile, tiffSaveOptions, true, Extension.LOWERCASE);  

};  [/code]

Found here;

https://forums.adobe.com/thread/1191107?tstart=0

Now, if only there was a way to keyboard shortcut a script!