How to best get 60mm drop with new shocks?

[Pipps]

I need to replace my original HDi shocks before the upcoming MOT - they're leaking.

I want 60mm front springs and new shocks all-round.

My priority is ride comfort over track-level handling.

On this basis, what kit should I buy?

I've also read this thread but I still have some questions.
- Do I have an adjustable rear beam already?
- What are adjustable top-mounts and do would need them?

Please forgive the basic questions. Thanks in advance for your help.

PS: Here it is currently at 40mm all-round - clearly it needs to go lower!