Help needed with v minor refurb of defender 110

Hi All,
Last time I did any work on a car that involved more than just changing a tyre was back in the 80's, so the enforced time at home due to "you know what" means I'm trying to do a few jobs on my 2005 Defender.
First problem I've encountered is how to get hex screws/bolts out when they are rusted in - any suggestions?
I've got the correct hex bit size, but these just aren't moving.

Second question concerns the wheel hubs - the front drivers side hub centre is rusting quite badly - see photo below. Should I just clean off the rust and loosen the bolts? Or can I Hammerite it?

Any advice very gratefully received
Thanks

Geoff

A lot of questions on a page that asks not to ask any at the top.

Try the defender section.

Bobsticle said:

A lot of questions on a page that asks not to ask any at the top.

Try the defender section.

Click to expand...

Apologies - I'm pretty new to the Forum and hadn't noticed the bit saying don't ask questions - I consider myself suitably chastised!