Is it worth getting drilled and grooved if I can only spend about £75 on parts and what names are best to look for and avoid ?

Ebay or somewhere like Euro car parts or main dealer ?

I used MTEC brakes. Got them all round and are very good and come with a choice of designs and coatings. Def worth a look at their site.

It all depends on what you have on your front.

You must NEVER put better brakes on the rear than the front. Also the front brakes do most of the braking anyway, (weight transfer) so not much point anyway.

I'd personally use the same pad compound as the front, but with plain discs.

I got Pagid parts from ECP with a 31% code. Been fine. Got them all round and I think they're a little better than OEM.