By James Brinsford Oti Mabuse has detailed the heartbreaking reality of working in TV. The star lamented the final episode on ITV of Ant and Dec’s Saturday Night Takeaway, after 20 years on our screens. Earlier in the night, Oti had been all smiles as she took part in an undercover segment with Olly Murs but later admitted there was a dark side to the festivities. The Dancing On Ice judge, and former Strictly Come Dancing professional dancer, took to Instagram to speak about the knock-on effect of a TV show ending and the difficulties it can give the production TV those working behind-the-scen…