Just by way of an update, Bramble has made fantastic recovery from surgery, so much so that the vet could hardly believe how quickly she was back on her feet. The histology results are back and neither tumour was malignant.
The upshot is that we are back on track with a lovely healthy adult dog, the kids don't have to face more bereavement, Mrs C and I can relax now and go back to a normal budget and the vet can cancel the new boat he ordered when we first brought her in.
We asked them for a quote on pet insurance just for a laugh. The answer was £50 per month, with an excess of £69 per intervention, no existing conditions, and a charge of only 15% of any treatment she receives under the plan . We would however be entitled to "generous discounts" on worming and flea prevention.
We did a few calculations and decided it would be cheaper simply to present the vet with a new Range Rover every couple of years.
(Becs, if you're reading this, I gambled on the fact that you wouldn't have drunk any Pinot at lunchtime on a Saturday, and would be able to appreciate a bit of irony.)