Nice post-mara running and very impressed by the speed shown by some; good luck to those racing. I'm taking it easy for a bit in light of the WP smackdown.
I have run the Kielder mara route, not in the big Steve Cram-backed event but in an NEMC members race. It was so small and low key that the prize for 2nd place was a bag of Mini Cheddars - not even a stand-alone bag, but one of the tiny ones from a multipack which say "not to be sold separately". Kielder is a glorious, remote place of trees, water and big skies; and just getting there is an adventure. But the course round the lake is essentially a gravel MTB switchback and absolutely not a place to run a fast mara.
I've also done lots of maras on 3 runs/wk, although not closely following FURST. IMO FURST looks very attractive on paper, but the paces & XT are actually very demanding and would mean injury risk to some. Plus, if you do all the prescribed XT you don't save any time.
Lorenzo: you are easily fit enough to do 100k, but probably lack time on the feet. What was the longest run or run/walk you did for Comrades? Personally I would recover from London, then maybe in 3wks time do a 4-5.5 hour run/jog, ideally off road & undulating, not worrying about the distance. Good way to get the head round time again. Also, I would find out exactly what food/drink is available at the race, and plan in detail what to eat, drink, carry, and wear. Calories/fluids/core temperature are crucial. It can be really hot up on the wall, or very cold, or very wet, or windy, or all those on the same day. Preparation is king for ultrarunners. It'll be a ball.
I have never suggested that MsE is a man. It was the "Ms" that gave it away.
Berlin changed fairly recently from first come first served to a ballot. I think the chances are much higher than for London. OTOH you can fly cheaply to Berlin from every corner of Europe, so it's only going to become more popular over time.
2nd May – Belfast Marathon – Badbark - Sub 3 21st May - White Peak - Gul Darr - 320 - 3.30 21st May - White Peak - Poacher - stay honest. 29th May - Comrades - BI - sub-9 29th May – Newry Marathon – Badbark – Sub 3 11th June – Portumna 100k Ultra – Badbark – Sub 9 hours as my ‘A’ goal. Finish with any time as my ‘B’ Goal - (My only DNF 2 years ago after 85k) 18th June - Race the Wall 100K - Lorenzo - no real idea, but I've told people at work that I'm aiming for under 12 hours so I'll stick that in. 25th June – Victoria Park Belfast, 12 hour race – Badbark – Run till I drop 24th July - Outlaw - thread smackdown - Slokey Joe and Moof 25th September– Berlin Marathon - G-Dawg - Sub-3.10...why not!? 25th September– Berlin Marathon - MsE - TBC 23rd October - Abingdon Marathon - Lorenzo - sub 3:05 23rd Oct - Abingdon - Jason T 3.14.59