I have reinstated breastfeed at 11am and will just slowly introduce formula in a sippy cup, over the next few weeks. He's almost 8 months so hopefully by the time I start back to work, he will have the formula sorted but if not, like you said he should be able to manage.
The weaning is going well, he has purée food but he has breakfast, lunch and dinner. I guess I just need to take a step back and stop panicking and slow down!
Thank you for your advice!