I'm looking to get a new laptop as I no longer have full time access to the laptop I was using previously due to personal circumstances. 
 
I know the sort of CPU I'm looking for, but my question is can I get away with getting one with only 4GB RAM?  I've previously had ones with 8GB, but the price difference is insane currently.  My music does tend to use a fair few Soft Synths.
 
Thanks in advance for any guidance. 

I would say 8 GB minimum.  New PC's will come with Windows 10, 64 bit OS and the 64 bit OS uses more of the basic memory than a 32 bit, thus less is left for applications.  Even 8GB may be questionable depending on how much synth files are used.  
 
I recently bought a new PC (for on-site recordings) and looking at the ones with only 4GB, they were not really what I would call a "DAW" type laptop, more for consumer use.  The one I bought was a Dell Inspiron 15, 5577 which is sold as a "gaming" laptop.  It has a 7th gen i5, 8GB of RAM (upgradeable) and came (standard) with a 256GB M.2 SSD.  I removed what I didn't want and it runs clean with the finicky Resplendence Latency Mon.  It boots up and loads programs (visually) as fast as my desktop DAW that has an i7 6700K CPU.

8GB is a good size for a "light DAW". 16 is better but not always necessary. I wouldn't try 4, even nearly 10 years ago I ran out of RAM with relatively few softsynths on a 4GB system.

Ok thanks for the replies.  Sounds like I need to bite the bullet and go with at least 8GB then. 

I will chime in to agree with the advice to get AT LEAST 8 GB memory.  You won't be able to change memory size with  a struggle. (maybe not at all)
  PS had a listen to a few of your covers.  You have a good voice and it is good to hear some of those oddies.  I particularly liked the Everly Brothers cover of Crying in the Rain.  

jeteague
I will chime in to agree with the advice to get AT LEAST 8 GB memory.  You won't be able to change memory size with  a struggle. (maybe not at all)
  PS had a listen to a few of your covers.  You have a good voice and it is good to hear some of those oddies.  I particularly liked the Everly Brothers cover of Crying in the Rain.  

Thanks very much :) 

A machine with 4GB RAM will easily become RAM-starved (hitting the VM-swapfile in lieu of physical RAM - which kills performance).
 
A Win10 machine (idle) uses about 2GB RAM.
Fire up Sonar Platinum (nothing loaded yet)... and you're at about 2.4GB.
Load up something like Superior Drummer 2 (one of the full kits)... and you're about maxed out at 4GB.
 
 

Thanks all for the replies. I've got myself a laptop ordered now, with 8GB RAM. :)