#1
any good for 100quid?

need a new guitar, not something too expensive just something to last me a while because my epi LP hardware is wearing out and i want a second guitar that i can use while i get it fixed.

either that or epi g-400
Gear:

Gibson lpj
Epiphone Les Paul Standard
Epiphone Les Paul 1960's Tribute Plus
Schecter s-1
Marshall JCM900 100WATT HEAD
Fender mustang 1
Dunlop Crybaby
Danelectro Distortion
Tanglewood exotic electro acoustic
Westfield Bass
#2
G-400 would be pretty much the same as your LP but mega light.
It'd be fun to rock around with.
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#3
the JR is actually a pretty good guitar and will be fine as a temporary replacement/backup guitar, from my experience, but £100 is a little too much to pay, since you could probably get one for around £80. the G-400 is a lot better though.
Rig Winter 2017:

Fender Jazzmaster/Yamaha SG1000
Boss TU-3, DS-2, CS-3, EHX small stone, Danelectro delay
Laney VC30-112 with G12H30 speaker, or Session Rockette 30 for smaller gigs
Elixir Nanoweb 11-49 strings, Dunlop Jazz III XL picks
Shure SM57 mic in front of the amp