Huawei Band 6 for 59.99 direct from Huawei.
Lovely big AMOLED screen, 24 hour heart rate and blood oxygen monitoring and 14-days of battery life.
The Huawei app is good, but doesn't link to Strava, which may be a deal breaker for some.
Comes with a free speaker (RRP £29.99) or set of smart scales (RRP £59.99).
Cheaper at Currys PC World but good if you want either of the freebies.
Delivery is £5 or free over £99.