Thanks Candace. Fortunately I had a kick start from the mature gravel I added from one of my other tanks so It's quite a bit faster than you should expect. I also had a stall where everything just ground to a halt because I didn't follow the instructions to the letter and had to start again, so that was my own fault.
Today, which is day 21 of the restarted cycle, both ammonia and nitrite are 0, but the ammonia was added 4 days ago so I've added dose no.5 this morning and I'll be checking it again tomorrow morning. Fingers crossed!
The blue shrimp are due to arrive on Thursday, so am hoping it clears in 24 hrs, but I have the other tanks that I can hold them in if need be.
I'm quite pleased with the overall cost of this little project:
Tank £12.99
Filter £7.99
Heater £6.99
Craft plastic mesh for lid £3.24
Thermometer £2.99
Decor all pinched from my other tanks £0
Total £34.20 for the set-up
The shrimp are costing £15.97 plus £7.99 P&P total £23.95 for the livestock
The water testing equipment and Kleenoff I already had so am not including that.