Minton tiled floor in porch

[whiterabbit]

We have a Minton black & white tiled floor in an outside porch. Several of the small tiles are loose and one area that has been under a rubber mat for many years is badly scored.
What's best for fixing the loose tiles?
Any ideas as what I might be able to use to restored the marked ones, then protect the whole lot from the weather?
Thanks for any help.

 

[TexMex]

What's best for fixing the loose tiles?

Tile adhesive, and then grout.

Any ideas as what I might be able to use to restored the marked ones

Tile paint.

to protect the whole lot from the weather?

Don't know but it sounds like rubber matting is out.