We don't have a crystal ball unfortunately and some of it will really comes down to how the magistrate feels on the day, how hungry they are, how much people have wound them up before your case is heard, etc.
Some things we can say...
The statutory minimum ban length is 3 years, because it's your second disqualification within 10 years for drink-driving.
You may be offered a drink driving rehabilitation course if you ask for it. This can reduce your ban by 25%, so if it was a 3 year ban, it could reduce it to 2 years and 3 months. The courts are generally very willing to offer the course to those who want it.
The sentencing guidelines for England & Wales blowing 85 set the starting point at 36-46 months disqualification, and a band C fine (150% weekly income) to a low level community order (e.g. 40-80 hours unpaid work). You won't get a fine and community order - it'll be one or the other.
The court will then consider any aggravating factors (in this case a previous conviction but this is already factored into the statutory disqualification length so can be ignored, and a collision with a vehicle). They'll also consider mitigating factors (making some assumptions here, but let's say short distance driven, showing genuine remorse, character references, caring for two children, and prospect of work/are currently in work).
Ultimately all we can say is the ban will be at least 36 months, may be reduced to 27 months if offered a drink driving rehabilitation course, and you'll get a fine or community order.
It is theoretically possible to get a prison sentence, which it's prudent to mention, but I'd bet my entire pension pot on you not getting prison time. You didn't injure anybody, your reading wasn't in the hundreds, you're undoubtedly going to show up in smart dress and show remorse.
You'll be off the road for a few years. Because this is your second offence within 10 years, DVLA will consider you a 'high risk offender'. This means you'll need a DVLA medical including alcohol blood tests to get your licence back. It's a few years away, but basically if you have a problem with alcohol, you need to get some help. When it comes to the medical, you'll want to be sober for at least a month before, possibly longer if you're a heavy drinker or have certain medical issues.
TLDR: 3+ year ban, fine or community service, DVLA medical before you get your licence back. Beyond that, it's impossible to be more specific.
On the plus side, nobody was hurt, it sounds like your partner is standing by you so you still have your family, and you said yourself you don't "mind" being banned for 10 years, so am assuming that while it'll be inconvenient and maybe embarrassing not driving, you'll be able to get on with life. The ban will pass quicker than you think.
