Ridders Ride

No worries, I'm sure there's plenty of first-timers, we'll be gentle with you I promise!  

Think I've sourced one of my coolant leaks to rear of block. There are 3 core plugs and at least one of them is weeping coolant out of it!!! Can these be changed with engine in if so how?
It also looks like the rad is leaking as cleaned it all off when I was looking for the block leak and found that to be also weeping!!!
Any thoughts on whether the likes of radweld will keep me going for a bit?

This is so nice

Wish mine was so nice and clean, love the brown interior!