Open University course finishes in October. Can I go straight to masters?

Basically my question is:
The final project portion of my degree finishes in the October (not this year). The other modules are done by June.
Will a university let me apply and go on to a masters in the same year, without having my degree certificate yet or is that just unheard of?
It's really annoying me that it finishes so late. Would I literally just have to wait an entire year?

I know there are some January starts for masters, but they are limited.
I also know contacting the individual universities would be the best way to find out, but I'm not looking at any specific universities right now and I just want to know if this is generally ever done or, in general is it mainly not allowed?

If having the previous degree is a pre-requisite of entry to the next degree (which is usually is), then no, you can't progress to the second degree without having the first degree completed, ie your final result confirmed and unchangeable.

I wouldn't rush to find a January start, unless you don't care about the uni experience or recruitment seasons, because you will be out of step with both if you join any time other than October.

Thanks.
This honestly annoys me to no end, why tf would they make it end in October.