im in the uk and lookin to buy some ram for an inspiron 1750

Hello,

Crucial sells memory in the UK.

Take a look at the memory pages at my web site for information as to why the correct memory is very important with Dell computers. :emotion-55:

Edit: Stay with two modules of the same size in order to still use the memory in dual mode.

this is a good site iv found the right model but is it easy to install and will installing it void my warranty

I can't comment on whether it will void your warrently but installation of ram is very easy.

Dell should have a service manual on their site guiding you on the installation. 

... Dell should have a service manual on their site guiding you on the installation.

Indeed Dell does. :emotion-21:

And, adding memory will not void the warranty unless you break something. :emotion-45: