Comments on your costs. With your additional income this is perfectly doable but you are way under on costs.
Rent 180k a year so 15k per month - Where are you looking at and do you want a villa or an apartment. If you want a villa, 180k is outskirts of Dubai. This isn't necessarily a bad thing - lots of schools are on the outskirts. When checking property sites be aware there are lots of fake listings and prices have gone up dramatically in the last year (and even more so in the last two years) so only look at very recent listings. Be aware it is common for landlords to expect annual rent to be paid up front. You can negotiate for this to be spread over the year - but anything more than quarterly is increasingly hard to get (and even anything but annual in more popular areas). Employers often allow for advances on salary to cover this but that will need to be repaid if the job doesn't work out (i.e. if you husband doesn't complete probation the full amount will need to be repaid and he may end up owing more than his final salary due).
School two kids around 90k a year 7.5k per month Have you found somewhere with places for those age groups at AED 45k a month? There are good schools for this amount (or cheaper) but they tend to be full and particularly for early primary. FS2/Year 1 places can be very hard to find. Southview as someone suggested is a good option if they have space - it's on the outskirts and there's a lot of (more) affordable accommodation around there BUT it will be a long commute for your DH. Also be aware that costs escalate at secondary - normally 60k+ (there are cheaper schools of course but as mentioned, they fill quickly).
Car 2k - Only 1 car? How will you manage the school run plus your husband's commute? Doable with one car if you drive and pick up your husband from work but will be a lot of time in the car for you and your kids, and not clear you'd have time on top of work. 2k for a car (all in) is also a low budget. Note you may not be able to get a car loan initially.
Utilities 2k - Maybe ok for electricity/water depending on what you're renting. Phones/internet will add around another 1k.
Food 2.5k per month - LOL! Double that, more if you are fussed about quality of food.
What you're missing? Everything else - any childcare, pension provision, trips home over holidays (v expensive), clothing, school uniform, iPads for the kids (will be required by the school), any extra curricular for the kids, medical fees (and potentially medical insurance for you and the kids), visa costs for you and the kids (if not covered), emergency savings to cover lack of a safety net. Plus set up costs are enormous.
If you're bringing in an extra AED 25k, then the money is fine to cover expenses and some savings but it isn't life changing money so whether it's worth moving depends on what this opportunity is like for your husband and what you're giving up in the UK. If the offer doesn't include medical insurance for you and the kids (it has to cover your DH by law) then I strongly recommend you get quotes for how much it would cost to get the cover you want before committing.
Final point, you haven't said what you do but be aware that you may struggle to get a job locally, and particularly one for anything like AED 25k a month. A lot of trailing spouses end up with a nasty surprise as they don't realize how competitive the job market is and how poor working conditions can be as well (long hours, lack of flexibility - for example standard for a nurse out here is a 48 hour week and they're generally paid less than UK). Appreciate you have the existing self-employment income but wanted to flag so you were aware. Entirely dependent on what it is you do of course, but outside of specific shortage skill areas this is the general position.