I thought I'd just add a coda to this. Last Monday, a week ago, looked like the only chance of a nice dry day for a fortnight, so I decided to go another ride. I was looking for something all-tarmac, as I don't see any point in pushing Hilda (literally or metaphorically) on unmade tracks when the new bike is on its way.
I settled on this, a loop of almost 45 miles (44.38 miles) starting and finishing in Innerleithen, the Bike Capital of Peeblesshire, which has more bike shops than you can shake a stick at, and car parks specifically advertising "park and pedal".
It was actually quite cold and more overcast than I'd hoped for, but the route was great. Absolutely nothing Hilda couldn't cope with quite easily apart from one short steep hill where I only had to walk 50 yards. The first 15 miles was through the Moorfoot Hills on the B709 and then the B7007, designated as part of the National Cycling Network, but with the poorly repaired and unrepaired potholes so bad I was slightly yearning for a full-suspension mountain bike in places.
At the top I met a bunch of men on ordinary bikes who said they'd done that route in the opposite direction the previous day. They probably realised Hilda is an e-bike.
Then I made my way by various local byways...
... to Waterheads on the A703, and down that main road to Eddleston. Fortunately there is a cyclepath alongside the main road. At Eddleston, could I resist the Horseshoe Inn and a coffee and cake? No I couldn't.
The question then was whether to continue on the main road directly to Peebles, or go over the Meldons? The main road is scary busy and I wasn't sure that the cycle path continued on it. The Meldons road is very pretty and actually not especially steep, but a great ride. I was just a bit worried that Hilda's integral battery might run out before I got to Innerleithen (the route is about five miles longer than the direct road), leaving me to cycle the last part under my own steam. (The range extender, which is used first, had died somewhere up in Midlothian.)
But the sun was coming out, and millionaire's shortbread is remarkably reviving, and in any case the last few miles would be back on the Tweed Valley Railway Path where I cycled a few weeks previously, and it doesn't have hills except for one new hump-backed bridge over the river. I nannied the battery a little on the ascent towards the top of the Meldons road, but I probably needn't have bothered because it was still showing 33% (11 miles) when I got back to the car. Sailed over that humpback bridge as if on wings.
New bike later this week or (more probably) next week. Hilda will have another friend.