By Emma-Victoria Farr, Shadia Nasralla and Lucy Raitano LONDON (Reuters) – Ithaca Energy made a lacklustre debut in London on Wednesday as the North Sea oil and gas producer defied volatile markets with Britain’s largest initial public offering of 2022. As Europe’s fifth biggest IPO of the year began trading, Ithaca’s shares fell as much as 11.6% below their 250 pence issue price, touching a low of 221 pence shortly after midday. At 1617 GMT, the shares were down 8.1% at 229.70 pence. The pan-European STOXX 600, meanwhile, was off 0.3% and an index of European oil and gas stocks fell 1.9% . It…