Just went through the same thing with a similar amount of money. Went with Lloyds and got 1.88% for 3 months; this was a bit higher than their advertised rate due to them being “our” bank, which also reduced hassle factor that worked in their favour; most other high street banks had similar or lower rates. I think we can trust Lloyds for that long given implicit UK gov backing. Beyond that, we’re thinking about stockpiling mattresses…
If you want to look “off the highstreet”, have a look at Cater Allen or Close Brothers (both suggested by our lawyers) who were offering >2% last time I looked.