Midlands

Derby Tri Club run two sessions a week here during the summer months. Wednesday 18:15-19:30 and Saturday 08:30-10:30. £3 for members, £5 for non-members. www.derbytriathlonclub.co.uk

Sessions are Saturdays from 08:00-10:00 and Thursdays from 18:00-20:00. www.topbarnactivity.co.uk

Bosworth Water Trust is a 50-acre leisure park. Tri and open-water swimmers can swim on Thursday evenings and Saturday mornings. www.bosworthwatertrust.co.uk

Absolute Tri make use of the superb facilities at the National Watersports Centre and offer sessions in the 2km rowing lake. There’s also a running track around the edge if you want to combine a swim and run session. However, these sessions are strictly members only. www.absolutetriathlonclub.co.uk

Activities Away run sessions on Saturday, Sunday and Wednesday evenings that cost £5 each and wetsuits are compulsory. There’s suit hire available if you don’t have your own. www.activities-away.com

Leicester Tri Club run open-water sessions here between May and September. There are two per week, Wednesday 18:30-20:30 and Saturday 07:30-09:30. The club don’t charge for sessions but, for insurance purposes, you have to be a member of the club to swim. www.leicestertriathlonclub.co.uk

Cambridge Triathlon Club have an agreement to use the lake between 18:15-19:30 on Friday evenings during the summer. Price is £1 for club members and £3 for non-members. www.cambridgetriathlonclub.com

The lake at Box End Park is open from spring, and has set times for anyone who wants to swim there. A day membership is £4, while a season-long membership is £75. Wetsuits are compulsory. www.boxendpark.com

The Blue Lagooners club run three sessions per week during the summer months, where the exact start and end dates are determined by the temperature of the water. They are Wednesdays 18:00-20:00 and Saturdays and Sundays 08:00-10:00. Sessions costs £3 for members and £10 for non-members, with wetsuit hire coming in at £4. www.bluelagooners.com