Joe, bad luck about the health issues, hope things may improve ? But if they don't, what are your priorities ?
I started my SIPP 3 yrs ago aged 59; a rank amateur. Decided my priority was to take the highest income I could until OAP kicks in @ 65; enjoy it while I can, carpe diem and all that. Was lucky with the timing of my GAD calculation, managed to get in under old rules (120% of equiv annuity, 5 years between assessments) and while market was high. Since last summer's crash my drawings look dangerously unsustainable but what the hell.
I keep enough in cash and solid stuff to cover my withdrawals until 65, then gamble recklessly with the rest, so far unsuccessfully. If banks, housebuilders and junior oils recover I'll be sitting pretty; if not I'll have to face the music at the next GAD reckoning but with the state pension as my safety net.
From my perspective your choices look, well, unexciting. Dividend income is all very well but where's your capital growth going to come from ? If you want to go down the income road, I guess that Tony Peterson, one of the doyens of these threads, would probably advise you to forget about funds and invest directly in income-bearing stocks - GSK, VOD, AV and the other usual suspects; long-term the ~1.5% TER saving makes a big difference.