Based on the total ratings, the top contenders for the 8.20 Sandown race are as follows:

1. Mountain Queen (IRE) with a total of 335.5. Despite some concerns about her return to turf, Mountain Queen has placed in two handicaps since her maiden win at Wolverhampton. However, she seems to be handicapped correctly, so she’ll need to put on a strong performance to outdo the competition.
2. Gert Lush (IRE) with a total of 306.7. Gert Lush finished last season in fine form, and while her reappearance run might have been below expectations, she’s on a competitive mark. With William Buick booked, she’s one to watch out for.
3. New Heights with a total of 297.6. New Heights had a strong performance on turf last season, winning three handicaps, including one over C&D on good ground. Her return to grass, after some less inspiring efforts on the AW, could put her back in contention.
4. Arenas Del Tiempo with a total of 297.4. Arenas Del Tiempo had a good run on the AW after reappearing from a break, but her performance on turf at Brighton was a significant step backwards. It will be interesting to see if she can bounce back in this race.
5. Ae Fond Kiss with a total of 285.0. While Ae Fond Kiss has been performing okay in her subsequent handicaps, she has yet to genuinely threaten. With a drop of only 2lb, she may still be vulnerable in this competition.

Based on the additional comments, Gert Lush (IRE) seems to have a positive outlook, with last season’s good form and the booking of William Buick hinting at a promising performance. New Heights also has a positive indication, with the return to grass expected to work in her favour. However, the other horses with high total ratings do not receive as glowing remarks, indicating potential challenges or drawbacks they might face in the race.

In conclusion, the race appears to be quite open, with Mountain Queen (IRE) leading the ratings, but Gert Lush (IRE) and New Heights having positive comments that might make them strong contenders.