I was 'made redundant' first day back from maternity leave. They'd given my job, dept and team to the sales director's wife.
They'd also told the firm's pension company I'd left four months earlier. The pension company then wrote to me, so I had documentary evidence. I was copied in on an email from mngt to my team, saying I wasn't coming back, at about the same time.
They didn't try to offer me an alternate role. I was the only person made redundant. They refused to pay my bonus or pension during my notice period. This after I'd worked for them for years, hit every target and been given a performance bonus.
If it hadn't been so annoying it would have been funny.
I had legal insurance as part of my home insurance. Direct Line were very good. Took one look at the evidence and told me to choose my own solicitor while they provided a barrister. Company held out for 9 months until the week before the tribunal, then paid me a year's salary to shut up and go away.
You need legal advice OP. Find an employment solicitor. If you have legal insurance, you will probably have to pay for the first consultation but after that, the insurance should cover it. Good luck.
To anyone else planning a baby, take legal insurance first. My £26 premium saved me a whole year's salary.