If I were in your position I would simply be accommodating of the situation. If the remedial work is really dragging on only then would I perhaps consider requesting compensation. Does your tenancy agreement reference such a situation?
What do you expect them to be able to do whilst work is being carried out?
What I did not mention was that we just got a notification (Form 4) advising of a rent increase.
I can accommodate the situation but not the rent increase.
Also, I would have thought that the Flat management would have asked for consequential damages to be taken into consideration. Example accommodation of parking provisions
Rent increase can possibly be negotiated down. Is the rent increase fair compared to rent of comparable properties in the area?
Are alternative parking provisions available in your area? It may be hard to secure any kind of alternative parking provision on such a short term IE for several weeks only.
I think that’s fair enough re increase. Tell them just that, I don’t think it’s unreasonable for them to delay the increase until it’s all completed. Informal chat can often go along way.