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Thanks all. Can't send photos: the last time it was emptied about half of the surround fell into it! I had to place the cover back on and, basically, bury it in soil - couldn't face fixing it in winter! It's definitely gone though - rusted all round and missing in places. The concrete that held...

Yes, that's a good idea. A&E? I still don't know how to go about fitting it though.

We have a septic tank system which is brick-lined and topped with standard, rectangular, covers. The problem is that, over the years, these covers (or, more precisely, the seatings) have become rusted and frayed. I want to replace them but, of course, the old ones are still in situ and, in...

Yes, it's funny as it does seem to be purposely made that way?

I bought one of those calipers with a digital scale - I know but I couldn't resist. The wheel that moves the jaw up and down is very loose: I nearly sent it back but then I remembered that I used one a few years ago and it was the same. Is this a "feature" rather than a "bug"?

Yeah, you're probably right, it's close enough, cheers.

I took one off and it is exactly 620mm x 470mm.

We have manhole covers over the septic tank in the garden that are rusting and becoming weak. I measured the size of the hole (i.e. the internal part of the frame ) to be 620x470mm. However, all the manhole covers seem to be 600x450mm or 24x18". Is my hole non-standard or am I measuring...

Thanks all.

My boiler is a Heatslave 12/14. May I ask two questions: 1. Easy one What do the numbers 12/14 stand for? 2. Impossible one How much would the installation of a modern equivalent of this boiler be - excluding the cost of the boiler? Just a ballpark figure would be great. Cheers.

Damn, thanks.

Brill thanks Jackrae. By the way, can I tighten that nut as tight as I can? It’s pretty tight now and still drips a bit.

It's 8mm. Thanks both. Andy: You're not wrong but I need other tools to blame for my workmanship! :D

Cheers both. Yes water does come out of the rad pretty sharpish! I'll leave well alone.

But the system pressure when cold is zero.

Ah. So I can ignore the pressure reading?

Indeed. That's why i want the proper tool for this job.

Well true but every time I use one I "round-off" the nut.

The pressure in my combi boiler (oil fired) seems to vary hugely. When the heating is on it is at about 1 bar. When the heating is off it can be as low a zero but then rises to 1 bar after a few minutes after the heating comes on. Other than this everything seems to be fine; both the heating...

The "tap" where the central heating is drained has a square nut on it. It's about 8mm square. I don't have a socket in my set that fits this (or is even square!). What is the tool called that fits this so that I can search for one? Thank you.