Saw these in my local TJ Hughes for around £1.49, they seem strongly-scented. Just about to test one out! These are from the Trongate, Glasgow store.
This size is online for around £2.50-£2.99.
Xmas 3 piece set is £4 at The Works http://www.theworks.co.uk/p/gifts-under-5/christmas-starlytes-scented-soy-candles---3-pack/5060169380080
Poundland also has Mainstays (a Wal-Mart brand) Wax Melts x 6 in Sweet Pea in this store - a few others out there too, such as Garden Rain and Dreamsicle (Union Street, Glasgow). These are really strong and highly recommended (along with their Coley & Gill-Poundland-brand 40 pack of tealights, which burn for 4 hours or so).