While I am, of course, concerned about the risks posed to the UK’s delicate biosystem by the inadvertent importing of harmful fauna and flora from foreign countries, your article (Colombian tree frog found by Sheffield florist highlights invasive species threat, 17 January) left a vital question unanswered. What happened to the little tree frog?
Sallyann Halstead
Fitzhead, Somerset
• Intrigued to read about the government promising a record investment in nuclear fusion (Ministers pledge record £410m to support UK nuclear fusion energy, 16 January). Reminds me of the old joke: fusion, for the last 70 years, has always been 20 years in the future – perhaps an experiment to prove time doesn’t exist in nuclear physics?
Dr Paul Dorfman
Chair, Nuclear Consulting Group
• You report (15 January) that Rolls-Royce is banking on the success of small modular reactors. I assume the company is also banking on not being around to clean up the nuclear waste.
Peter Gray
Chesterfield, Derbyshire
• Your article (14 January) reveals that the Wellcome Trust paid fees of £11m for the management of its investment portfolio. The return was 5.2%. It might have been better off putting it into a building society.
Jim Golcher
Greens Norton, Northamptonshire
• I have often thought about changing my name (Letters, 16 January), but resisted and was never out of work. However, after passing by a motorcycle shop in Newport, Isle of Wight, proprietor Dave Death, I think sometimes it might help.
Rowan Vuglar
London
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