Thanks Muddy - running 22 miles after parkrun last week was okay for me but I'm not sure I'd be up to a 10k then a really long run the next day (I notice even P&D seem to keep the race tune ups and the 20+ milers apart although they think 17 and 18 milers are okay so not much difference really).
To go with that terrible attempt at a joke above here is my favourite Scottish joke at the moment.
A guy goes into a Scottish baker's. "How much is that cake?" "A poond." "And how much is that one?" "A poond. All ma cakes are a poond!" "Oh, OK. What about that one?" "Ach, that one's two poonds." "Oh. Why's that then?" "That's Madeira cake.".