Bonham's auction as part of the Bristol Classic Bike show (which is 25 miles from Bristol!); there's enough being sold too make getting in worthwhile -a sweet Bultaco Metralla 250, a Steib sidecar, a bonkers-leaning 3-wheel Honda Stream and a Vincent moped! Prices will be a good litmus - the car world in running away, with people talking about £20m Ferrari 250s, and I fear the (better) bikes will follow; a standard Ducati 750F1 (which I commended here when they were about £7k) has just sold for £15,000. Compare that to your cash ISA..
Bonham's say this lovely little Monty "was acquired in September 2007 by the vendor, who advises that the modifications were made over a period commencing in the late 1980s. The rear suspension has been converted to mono-shock configuration, the engine bored out to 544cc capacity, and many other upgrades incorporated into this unique machine. Described by the private vendor as in generally excellent condition, this iconic Italian sports roadster is offered with current MoT, Swansea V5C document and many expired MoT certificates and bills detailing the work carried out."
But I'd find the extra and buy the 1977 (listed as a 75 - see blog passim) Ducati 900SS: Vincent money in the making, especially if Rossi takes the Bolognese firm to MotoGP glory