Newbie in the uk

Hi I am 53 years old and just starting out on MFP. I weigh 277lb after losing 4lb in my first week . I have health issues which stops me from doing too much exercise, I have tried this before and lost around 21lb before slacking off and with difficult circumstances in my life have managed to put it all back on again.. This time I am determined to succeed so I am looking for inspiration and motivation from these boards...