Thanks for all the suggestions folks.
I finally decided on a set of Bartolinis, so bought some from Bass Direct.
They turned up with broken lugs (on my birthday! Boooo!) so they went straight back.
Full refund including return postage the minute they got them back, top marks to Ash at BD.
As luck would have it, a set of Lindy Fralin 5% Overwound (the very ones recommended by @Bigguy2017 ) appeared on ebay the next day, so I snapped them up for eighty quid less than a new set. Get in!
I also went for a @KiOgon VBT loom with S/P pot, which is a beautifully made little thing.
It all went to the luthier yesterday (I need a grownup to do that sort of thing for me, I'm barely allowed to handle safety scissors), I should have it back today or tomorrow... I'm like a toddler on christmas eve.
@Raslee Thanks for the offer, I'm sure they're lovely, please sell them to @krispn !
Thanks for all the replies, much appreciated.