Am I ok to I hand in my notice?

[FerreroRochey]

Hiya, so I've received the offer letter and contract, I need to sign both and return these to them. The offer is subject to satisfactory references, Dbs and right to work.

Provided I sign and return these, should I send my notice? Surely, if I am to ask for a reference, I need to send the notice first?

Also, in the notice email, do I attach HR? And can I use HR as reference?

Thanks

Depends. We always told successful applicants not to hand in their notice until DBS, clearances and refs had been obtained. We didn't want someone to have handed their notice in , if a problem showed up. ( healthcare environment) .
We had someone who had given their notice despite the warning, and then there was a problem-so the offer was withdrawn, and her previous employer would not allow her to withdraw her notice. I can't remember the precise circumstances now.

We never advise people when to hand their notice in but do not tell them not to either. Some like to wait and often ask us to contact their current employer last so they know everything else is fine before they tell them. In my sector we rarely withdraw offers unless it's something like they lied about their right to work but we normally have their right to work quite early in the process.
We take HR details for references. I think it's depends on the company. Many references come back with little detail anyway.
Congratulations on your new job

Forgot to say some people do tell their manager but don't officially hand their notice in. So the manager doesn't get a shock by the reference but you haven't actually put your notice in so not obligated to leave at that point. Whether you feel comfortable with this depends on how well you get on with your manager.