just write to the vicar of the parish church where the christening was held and he (or she) will send you the details, when i was christened my surname was spelt wrongly on the card my Mum was given, but in the register it is correct, i wrote to the vicar in 1993 and he wrote an amendment on my card and confirmed that the register entry was correct, so the register was still at the Church. as long as the register is not full and been sent to the diocesan record office the vicar will confirm the entry for you.